The body material system: high material aluminum Sponge Material: 1CM thick sponge The total weight : About 640 grams, the total length of about 37CM, both ends of the width of about 30CM, width about 10CM in the middle. Suitable for installation in 22.2-25.4 caliber handle bar. as for the carbon bike please do not install it for too tight, as it might be split/spoil your handle bar. It is suitable be use when cyclist maintain a certain speed for a long time during the ride, and it can be use while the road is in good condition. Because the rest/handle/aero bar has no brakes system.