Feature:1. High durability, good impact resistance, high tooth shape, increase the possibility of riding.2. Easy to install, no need to adjust the transmission system, the unique mountain bike chain design, can well control the transmission function.3. Independent small tooth ring, bicycle card flywheel teeth are often used in the process of use, independent design of small teeth for future replacement and maintenance.4. Through the special tooth shape and incline to provide fast, accurate indexing conversion function, within the range of 10 speed to provide a stable gear, accurate positioning.5. Strong compatibility,fit for 10 speed drive systems (except for XD).Spec:Item Type: Bicycle FreewheelColor: As Pictures ShownMaterial: High-strength SteelSpeed: 10 SpeedWeight: Approx. 658g/23.2ozNumber of Gear Teeth: 11-13-15-17-21-24-28-32-36-42T Package List:1 x Bicycle Freewheel2 x Gear1 x Lock Ring