Brand Name: Components:Freewheel Gear Teeth:36 - 42T Flywheel Adjustable Gear Number:10-speed Freewheel Speed:10 Model Number: CSM10XL Weight: about 510g RATIOS: 11-13-15-17-19-21-23-25-28-32T-36T-40T The material of high tensile steel made by the technology of quench-temper hardening, makes it more durable and has extreme resistance to abrasion. design of the gear sprocket exclusively for mountain bike, provides you a better experience to control the shifter. We adopted the hollow design to reduce the weight to some extent. The surface made by the technology of chrome plating, makes it hard to rust and provides a long service life. And the surface of black-silver has a fine appearance and will give you a luxurious feel. Attention We have got the reference description , please check the actual need with your bicycle before order this product. For your safety, please be careful with special tools when installing. If you can not install it well, please go to a nearby bicycle store for help. Suggestion: If you want to replace a new cassette, you had better to install a suitable chain at the same time, otherwise the shifting system may cause significant noises and failures in working. colour:Silver Material:steel size:19.9 * 19.9 *6.7cm Package Contents: 1 * flywheel Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.