Deep Blue

Heavy Duty Stainless Steel Swivels for Spearfishing

The Heavy Duty swivels are made from high-strength stainless steel and specifically designed to ensure reliability and durability for spearfishing and freediving. After extensive research and in-depth testing, they have been added to the DEEP BLUE catalog to meet the demands for strength and reliability in the water.

Technical Features and Applications

• Available Sizes: 5 mm, 6 mm, 7 mm, 8 mm.
• High breaking load: the 7 and 8 mm swivels are recommended for extreme-load applications, such as bluewater hunting, where superior strength is required.
• The 5 and 6 mm versions are suitable for everyday spearfishing, while still providing excellent holding power even with large fish.
• Made with materials suitable for the marine environment to ensure long service life and corrosion resistance.

Packaging and Use

The swivels are available in 2- or 3-piece blister packs, ideal for easy storage and transport. Their construction and the materials used ensure reliable, long-lasting performance during dives and spearfishing sessions.

Heavy Duty Black 8.0 mm Swivels for Spearfishing and Freediving Gear

The 8.0 mm Heavy Duty Swivels feature a black nickel-plated finish that provides corrosion resistance in marine environments, ideal for underwater applications such as spearfishing and freediving.

These accessories are the result of extensive research and targeted testing to ensure high mechanical performance under heavy load conditions. They are specifically designed to withstand breaking loads up to 260 kg, ensuring reliability during aiming and retrieval phases in deep Freediving.

Technical Specifications

• Swivel diameter: 8.0 mm
• Material: steel with black nickel-plated treatment for corrosion protection
• Breaking load: 260 kg
• Package: 2-piece blister pack

Applications

The swivels are suitable for connections and joins in spearfishing, enabling strong, secure force transfer between lines and terminal tackle, reducing torsional wear and increasing the overall service life of Freediving gear.

Shark Clip Carabiner in High-Carbon Stainless Steel

The Shark Clip carabiner is made from high-carbon stainless steel, ensuring mechanical strength and durability in marine environments. The integrated swivel provides full rotational freedom, preventing unwanted twisting of the cables or lines it is connected to.

Technical Applications in Spearfishing

This clip is designed for a range of needs in spearfishing and freediving, and is ideal for connecting:

• Floatline
• Bungee
• Buoys

It can also be positioned under the speargun handle to create a quick connect and release point, improving practicality during dives.

Available Versions and Sizes

The Shark Clip carabiner is available in two sizes to suit different setups and technical requirements:

• Standard
• Large

Technical Features and Benefits

• Material: High-carbon stainless steel, corrosion-resistant, suitable for marine environments.
• Integrated Swivel: Ensures twist-free rotation of connected lines and components, improving smooth operation underwater.
• Design: Designed for easy quick release and connection, optimizing timing and safety when using the speargun
• Versatility: Can be used at multiple attachment points during spearfishing, increasing the efficiency of underwater gear.

7x19 Stainless Steel Cable for Freediving and Spearfishing

The cable is made from high-quality stainless steel to military specifications, delivering a 25% higher breaking load than standard commercial AISI 316 cables. The 7x19 construction, made up of 133 strands, ensures high flexibility, ideal for the specific technical requirements of spearfishing and freediving.

Technical Features

• Construction: 7x19, ultra-flexible
• Material: AISI 316 stainless steel to military specifications
• Breaking load: 25% higher than standard commercial cables
• Available diameters:
  • 1.6 mm with strength up to 218 kg
  • 2.4 mm with strength up to 417 kg

Applications

The cable can be used as a replacement for Slip-Tips or to replace nylon monofilament on the shaft when maximum mechanical strength is required. It is also suitable for making fish stringers, flashers, and safety cables during static and dynamic freediving training, offering an excellent combination of strength and flexibility.

Technical Notes

Sold by the meter.

EPDM flopper-retaining O-Ring for spearfishing shafts

O-Ring made from high-quality EPDM, designed to keep the flopper on spearfishing shafts closed and tight against the shaft body at all times. Its function is to ensure mechanical stability during the descent and bottom ambushes, preventing accidental flopper openings that could compromise the shot line.

Compatibility and availability

• Compatible with shafts from 6.0 mm to 8.5 mm in diameter
• Suitable for all flopper types, both single and double
• Available in blister packs of 20 pieces
• Three sizes for a precise fit: Small, Medium, Large

Functions and technical benefits

Using the flopper-retaining O-ring prevents disturbance during ambushes, keeping the flopper from opening accidentally and requiring manual closing to maintain a clean shot line. It also prevents unintended opening and closing during the descent or while holding position on the bottom, reducing the chance of creating noise that could spook approaching fish.

Silicone Flopper Stop O-Ring for Spearfishing Shafts

The silicone flopper stop O-ring, designed for use on spearfishing and freediving shafts, keeps the flopper consistently closed both during the descent and while waiting on the bottom. Thanks to its position on the flopper, it keeps it snug against the shaft body, ensuring a clean, uniform shot line.

Technical Features

• Made from highly elastic, soft silicone, ideal even for winter freediving with thick gloves
• Compatible with shafts from 6.0 to 8.5 mm in diameter
• Suitable for any type of flopper, both single and double
• Available in 20-piece blister packs for easy replacement and maintenance
• Three different sizes to fit various flopper dimensions perfectly: Small, Medium and Large

Benefits of Use

Using the O-ring prevents the flopper from opening accidentally during the descent or while waiting on the bottom, helping to avoid:

• loss of tension on the shot line, maintaining an accurate trajectory
• sudden flopper openings that could create noise and scare off approaching fish
• the need to manually close the flopper again during the breath-hold dive

Usage Details and Compatibility

Thanks to its elasticity, the O-ring adapts easily even in diving conditions with thick gloves, keeping the flopper firmly in place without limiting smooth handling in the water. It is an essential technical solution for spearfishing and freediving, improving the efficiency and practicality of underwater equipment.

Standard Flopper Lock O-Ring for Freediving Spearfishing Shafts

Flopper lock O-ring designed to keep the shaft flopper closed and snug during the descent and while waiting on the bottom. This component is essential for ensuring a clean shot line and optimal hydrodynamic trim during freediving spearfishing.

Technical features

• Compatible with shafts from 6.0 to 8.5 mm in diameter
• Suitable for any type of flopper, both single and double
• Available in three sizes: Small, Medium, and Large
• Sold in blister packs of 20 pieces

Functional advantages

The O-ring prevents the flopper from opening inadvertently during the descent, maintaining a consistent hydrodynamic profile and reducing unnecessary drag while moving through the water. When waiting on the bottom, it ensures the flopper stays securely closed, avoiding unwanted noise that could spook approaching fish.

Using this retainer helps avoid manual flopper adjustments while underwater, improving operational fluidity and speargun tracking precision.

Silver Nickel-Plated Copper Sleeves for Spearfishing

Sleeves, or crimps, made from nickel-plated copper with a Silver finish are specifically designed for the needs of freedive spearfishing and spearfishing. Manufactured from durable materials, these double-barrel sleeves allow secure, long-lasting crimping of nylon monofilament, steel cable, and high-strength sheathed lines.

Technical Features

• Material: nickel-plated copper with Silver finish for improved mechanical strength and corrosion protection in marine environments
• Use: designed for crimping monofilament, cable, and Hi-Tech lines, enhancing fastening efficiency and connection durability
• Compatibility: suitable for cables with diameters from 1.0 mm to 2.5 mm, covering a wide range of spearfishing applications
• Type: double-barrel sleeves, optimized for crimping with dedicated sleeve crimping pliers
• Packaging: available in blister packs of 10, 15, or 20 pieces depending on size, for practical and easy material handling during assembly

Specific Applications

These sleeves make it possible to create reliable connections on lines and monofilament used for rigging spearguns, band-powered spearguns, shooting lines, and other freedive spearfishing components, ensuring stable and long-lasting mechanical holding power even during extended dives.

Technical Advantages

• Mechanical and corrosion resistance ensured by nickel-plated copper with Silver finish
• Adaptability to different cable diameters, ensuring versatility when rigging equipment
• Simple, precise installation with dedicated sleeve crimping pliers, for a secure connection with no play

AISI 316 Stainless Steel Cable for Freediving and Spearfishing

The cable is made from AISI 316 stainless steel, ensuring high corrosion resistance and excellent durability in marine environments. Thanks to its 7x19 ultra-flexible construction, it provides excellent handling and adaptability across various spearfishing and freediving applications.

Technical Applications

• Spare Part for Slip-Tip detachable tips, providing a strong and reliable connection
• Use as a replacement for nylon monofilament for connecting to shafts, ensuring greater mechanical strength
• Making fish stringers, flashers, and safety cables during pure freediving training
• Other technical uses related to spearfishing that require high strength and flexibility

Technical Specifications

• Cable diameter: 2.0 mm
• Construction: 7x19 strands to maximize flexibility
• Minimum breaking load: 229 kg, suitable for high-stress applications

Usage Notes

Sold by the meter, allowing you to cut the desired length according to the specific needs of the spearfisher or freediver.

AISI 316 Stainless Steel Cable for Freediving and Spearfishing

The cable is made from AISI 316 stainless steel, known for its high corrosion resistance in marine environments, ensuring durability and reliability in underwater conditions. The 7x7 construction gives the cable optimal flexibility, essential for versatile use in spearfishing and freediving activities.

Technical Applications

• Spare Part for breakaway tips (Slip-Tip) on spearguns
• Alternative to nylon monofilament for shaft rigging when maximum mechanical strength is required
• Assembly of fish stringers and flashers, ensuring strength and durability
• Safety cable for pure freediving training, ensuring reliability and safety

Technical Features

• Material: AISI 316 Stainless Steel resistant to marine corrosion
• Construction: 7x7 for a combination of flexibility and efficiency in load handling
• Available diameters: 1.5 mm and 2.0 mm, suitable for different technical requirements
• Sold by the meter, allowing custom cuts

Important Notes

WARNING: This product is sold by the meter. It is essential to choose the most suitable diameter based on the specific application in freediving or spearfishing equipment.

HI-TECH DYNEEMA Line for Freediving and Spearfishing

The HI-TECH DYNEEMA Line is made with an inner braid composed of 100% Dyneema® SK78, wrapped in an outer protective sheath also made from 100% Dyneema® SK78. The process used to bond the braid and sheath employs a special method that gives it unique technical characteristics among lines for spearfishing and freediving.

Technical Properties and Strength

This line stands out for its very high breaking strength, mainly due to the inner core, which ensures a high breaking load. The ultra-resistant sheath provides key properties such as abrasion resistance, mechanical toughness, and optimal stiffness—essential features for underwater use in environments with abrasive surfaces such as rocks and coral.

The main cause of failure in traditional lines is abrasion caused by repeated contact with the shaft, hard surfaces, or metal structures. HI-TECH DYNEEMA minimizes this issue thanks to Dyneema® SK78, a fiber known for its exceptional resistance to cutting and wear, and to the thick, tightly woven outer sheath, reinforced with double polyurethane impregnation, which increases stiffness and abrasion durability.

Applications and Benefits for Freediving and Spearfishing

• Can replace monofilament in applications that require reliable hold for connection to the shaft.
• Ideal for spooling reels with a compact, neat, and durable line, improving handling during the dive.
• Perfect for making textile wishbones: the textile wishbone made from HI-TECH DYNEEMA offers up to ten times greater durability than traditional Dyneema lines with a polyester sheath or single-fiber braids.

Specific Features

• Material: 100% Dyneema® SK78 for core and sheath
• Sheath thickness: Very tight weave with double polyurethane impregnation
• Abrasion resistance: High, thanks to the unique combination of materials
• Breaking load: High, ensuring mechanical reliability
• Stiffness: Optimal for easy handling and reduced knot formation
• Buoyancy: The line is ultralight and buoyant in water
• Durability: High resistance to UV rays and wear over time
• Colors and diameters: Available in multiple colors, with diameters from 1.4 mm to 2.5 mm
• Availability: Sold by the meter and in 50, 100, and 150-meter spools

Strength and Load Ratings

• Abrasion resistance: ★★★★★
• Breaking load: ★★★★☆

MAX-LOAD DYNEEMA Line in Dyneema® SK99 for Freediving and Spearfishing

The MAX-LOAD DYNEEMA line is a technical braid with no outer sheath, made from 100% pure Dyneema® SK99 fiber, the material with the highest breaking load currently available on the global market.

Compared to a standard 1.0 mm Dyneema SK78 line with a breaking load of around 150 kg, our MAX-LOAD in SK99 of the same diameter reaches twice the breaking load, at 300 kg, ensuring safety and reliability even in the most demanding spearfishing conditions.

Main technical features

• Material: Dyneema® SK99 fiber, heat-treated and pre-stretched to maximize toughness and strength
• Elongation: virtually zero, ensuring control and precision during retrieval and reliable line management
• Coating: polyurethane coating for a compact, easy-to-handle line, with optimized waxing
• Buoyancy: ultralight weight that makes it easier to manage in the water without weighing down the line
• Resistance: high mechanical toughness and excellent UV stability, reduced water absorption for extended durability

Available variants

• Available by the meter, in 50- and 100-meter spools
• Available in 7 diameters: 1.0 mm, 1.25 mm, 1.5 mm, 1.7 mm, 2.0 mm, 2.5 mm
• Breaking loads from 300 up to 1440 kg, to suit different freediving and spearfishing applications

Usage recommendations

This line is ideal for freedivers and spearfishers who need a product with high tensile strength and minimal stretch to ensure precision and control while spearfishing.

The compactness and light weight of the braid improve handling and ergonomics in the water, reducing fatigue during the dive.

Technical rating

• Mechanical strength: ★★★☆☆
• Breaking load: ★★★★★

100% Dyneema® SK78 Line for Freediving and Spearfishing

The 100% Dyneema® SK78 technical braided line is made without an outer cover, delivering an extremely high-performance product for the breaking loads required in spearfishing and freediving. This waxed braid, available in several colors, features a polyurethane coating that provides greater compactness and makes splicing easier.

Technical Features

• Material: Dyneema® SK78 synthetic fiber with breaking loads higher than steel
• Available diameters: 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.5 mm and 3.0 mm
• Breaking load: from 185 kg up to 880 kg depending on diameter
• Coating: Polyurethane waxing to improve handling and compactness
• Availability: by the meter, 50, 100, 150 and 200 meter spools

Functional Benefits

The ultra-light weight of the line allows it to float, making it easier to manage in the water during spearfishing sessions. Its high tenacity enables it to withstand heavy loads without losing integrity, while low water absorption keeps rigging light and precise. Excellent UV resistance ensures extended durability even with constant sun exposure.

Applications

• Spooling reels for freediving and spearfishing
• Tying and securing speargun bands
• Shooting line for supporting heavy loads during retrieval
• Additional technical uses in spearfishing thanks to the versatility of the diameters

Strength and Load

• Mechanical strength: ★★★☆☆
• Breaking load: ★★★★☆

Dyneema® SK78 Line with Polyester Protective Sheath for Spearfishing

The Dyneema® SK78 line is made with a high-strength central braid covered by a protective polyester sheath, a combination that ensures an effective balance of strength and long-term durability. This type of line is among the most widely used in spearfishing thanks to its technical reliability and excellent value for money.

Technical Features

• Material: Dyneema® SK78 braid with polyester protective sheath
• Available diameters: 1.5 mm, 1.8 mm and 2.0 mm
• Available colors: two color variants
• Supply: sold by the meter, 50 m and 100 m spools

Strength and Load Specifications

• Mechanical strength: ★★★☆☆
• Breaking load: ★★★☆☆

Recommended Uses

This line is ideal as a connection element for the speargun shaft, but it is also suitable for making textile wishbones and other spearfishing applications where reliability and durability are required. The polyester sheath provides effective protection against mechanical wear and abrasion typical of the aquatic environment.

Clear Blue Nylon Monofilament for Spearfishing

Monofilament made from high-quality Clear Blue nylon, featuring a transparent blue color ideal for spearfishing. This line combines excellent mechanical strength with a calibrated degree of flexibility, avoiding excessive stiffness that could compromise handling during the dive.

Technical Features

• Available diameter: 1.8 mm
• Breaking strength: 170 Kg
• Color: Transparent blue
• Material: High-quality Nylon selected for durability and reliability

Applications and Compatibility

The monofilament is specifically designed for spearfishing and freediving, providing a balance of strength and flexibility suited to the needs of freedivers and spearfishers. Its light weight and excellent transparency minimize visual impact in the water, helping you make a stealthy approach to fish.

Sold by the meter, allowing you to purchase the exact quantity needed for your specific requirements. Compatible with dedicated sleeve crimps, available in the relevant section, for building reliable, long-lasting custom rigs.

Important Notes

• Sold by the meter: specify the desired length to optimize your supply.
• Use of sleeve crimps is recommended to ensure effective and secure connections.

Blue Gum Natural Latex Band for Spearfishing

The Blue Gum band is made from pure natural latex with fully Italian production and extrusion, specifically designed for spearfishing. The glitter blue color makes it easier to identify in the water, while the progressive structure ensures even tension, delivering smooth, accurate shots.

This rubber is compatible with classic and roller spearguns, optimizing energy transfer during release to maximize shot accuracy and power.

Technical features

• Band diameter: 15.0 mm
• Standard bore: 3.0 mm
• Material: 100% high-quality natural latex
• Recommended stretch: 330% - 400%

Important note: the price is listed per centimeter of band.

Primeline Black Band for Spearfishing

The Primeline Black band is made from pure American latex, produced to specification by one of the leading U.S. manufacturers of bands dedicated to spearfishing. Its black color and the progressive nature of the material make it suitable for both traditional and roller spearguns, ensuring effective power transfer and controlled elongation.

Technical Features

• Material: 100% high-quality American latex
• Color: black
• Type: progressive band, optimized for spearfishing and freediving
• Recommended elongation: 300 - 380%

Available Diameters and Bores

• Standard bore (3,0 mm) available in 13,0 mm, 14,0 mm, 16,0 mm, and 18,0 mm diameters
• Small bore (Small ID - 1,6 mm) available in 14,0 mm, 16,0 mm, and 18,0 mm diameters

Note: the listed price is per centimeter.

Use and Benefits

Thanks to its specific formulation and the progressive response of the latex, this band ensures uniform elongation and consistent tension, improving speargun responsiveness and accuracy during tracking. The material quality provides mechanical strength and durability even under intensive use in the marine environment.

Ideal for freedivers and spearfishers who require a reliable, high-performance band with a smooth response and a high level of comfort in use.