The Box One Levers are cold forged and CNC-machined from the highest-quality 6061-T6 aluminum, making them strong and stiff, yet super lightweight, at 55g/1.9oz. Unlike other lightweight levers, these levers have a built in return spring. Other features include adjustable reach, a titanium mounting bolt and stainless steel hardware. These levers are designed to work with linear-pull brakes.