The Box Genius Levers are cold forged and CNC-machined from the highest-quality 6061-T6 Aluminum, making them strong and stiff, yet super lightweight, at 50 grams/1.7 ounces for the short models and 55 grams/1.9 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 and stainless steel hardware.Genius levers are designed to work with linear-pull brakes and are excellent for BMX, mountain, city, urban and tandem flat-bar bicycles. Meets or exceeds ENBMX Category 1 standards.Key Features:50 grams/1.7 ounces (short reach), 55 grams/1.9 ounces (long Reach),22.2mm Clamp size,For V-Brake.