Feature:1. Using highstrength steel, it has good corrosion resistance and heat resistance, compatible for SRAM XD hub.2. Made by tempering and quenching process, it has higher strength, durability and strong wear resistance.3. It has strong oxidation resistance, is not easy to rust, and has a long service life, so it can be used with confidence.4. With a hollow design, the weight is reduced, and it will not add too much burden to your bicycle when using it.5. The surface adopts chrome plating technology, and the silver surface has a delicate appearance.Specification:Item Type: Freewheel CassetteMaterial: SteelProduct Color: As Pictures ShownProduct Weight: Approx. 547g / 19.3ozGear Ratio: 9-42T (9-11-13-15-18-21-24-28-32-36-42T)Compatibility: For SRAM XD Hub.Package List:1 x FlywheelNote:After the installation is complete, check whether the flywheel is locked and whether it is aligned.