{"product_id":"coltello-c4-naifu-s-black","title":"Knife Naifu S - Black","description":"\u003ch2\u003eNaifu S Arm Knife for Freediving and Spearfishing\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eNaifu S\u003c\/strong\u003e is an arm knife designed with an ergonomic shape to ensure comfort and practicality during freediving and spearfishing activities.\u003c\/p\u003e\n\n\u003ch3\u003eBlade Technical Features\u003c\/h3\u003e\n\u003cp\u003eThe blade, 66.5 mm long, is made from \u003cstrong\u003eAISI420B stainless steel\u003c\/strong\u003e, known for its combination of strength and hardness. The blade is extremely sharp and includes an integrated line cutter. Its internal structure extends along the entire length of the handle, ensuring optimal rigidity and greater reliability in the water.\u003c\/p\u003e\n\u003cp\u003eThe blade heat treatment involves vacuum hardening at 1020°C, followed by nitrogen cooling at 20 atm, to improve hardness and mechanical strength.\u003c\/p\u003e\n\n\u003ch3\u003eHandle and Sheath\u003c\/h3\u003e\n\u003cp\u003eThe handle and sheath are made from recyclable \u003cstrong\u003ePOM acetal resin\u003c\/strong\u003e, a plastic material characterized by high rigidity, low moisture absorption, and anti-friction properties, ideal for use in underwater environments.\u003c\/p\u003e\n\u003cp\u003eThe knife measures 144 mm in overall length, ideal for ensuring control and safety. The locking system uses a central retaining tooth that makes both fastening and release easier, improving practicality and speed of extraction during the dive.\u003c\/p\u003e\n\n\u003ch3\u003eFastenings and Accessories\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eEquipped with two rubber straps with stainless steel loops for fastening to the arm or leg, ensuring stability during underwater activity.\u003c\/li\u003e\n  \u003cli\u003eThe sheath features a rear hole for optional bungee mounting, increasing fastening and safety options.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlade material:\u003c\/strong\u003e AISI420B stainless steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlade length:\u003c\/strong\u003e 66.5 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall length:\u003c\/strong\u003e 144 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHandle and sheath color:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"C4","offers":[{"title":"Default Title","offer_id":56784335602009,"sku":"0KNIVESC4NAS","price":26.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/6732\/1945\/files\/Coltello_Naifu_S_-_Black.png?v=1782078937","url":"https:\/\/deepbluesub.com\/en\/products\/c4-naifu-s-black-knife","provider":"DEEP BLUE - Freediving \u0026 Spearfishing","version":"1.0","type":"link"}