The Box Genius Levers are cold forged & CNC-machined from the highest-quality 6061-T6 Aluminum making them strong & stiff yet super lightweight at 55 grams 19 ounces for the long models they beat any lever on the market Unlike other lightweight levers Genius levers have a built in return spring Other features include adjustable reach a titanium mounting bolt & stainless steel hardware Genius levers are designed to work with linear-pull brakes & are excellent for BMX mountain city urban & tandem flat-bar bicycles Meets or exceeds ENBMX Category 1 standards Key Features 55 grams 19 ounces 222mm Clamp size For V-Brake