In the case of the 2 in-line pulleys, the overlapping of the rubbers is avoided thanks to a simple, yet intelligent, differentiation of the pulley diameter. 

The front pulley is larger in size, while the rear pulley is smaller. This allows for an extremely compact double roller solution, at the same time the two tires are free to work without friction between them.

 

This revolutionary design allows the tires to wrap around the rifle barrel in a very compact manner allowing for a very low footprint and exceptional swing. 

This concept drastically reduces resistance and bulk compared to other double roller models on the market, which normally feature side-by-side or partially offset pulleys.

  

Kits Double Roller Power Head - Glass are composed of a sturdy main body, manufactured from mold, 4 pulleys equipped with glass bearings, ultra light carbon fiber side plates, integrated line feed, three different types of dyneema line, barrel adapter, elastics, rocker tie and easy to follow assembly instructions, which explain with detailed pictures how to properly install the kit on any rifle.

 

Available with 14 and 16mm rubber bands, and 24.5mm to 26.5mm adapters.