The microSHIFT ADVENT X E-Series cassette is designed for the rigors of E-bikes. This cassette utilizes a harder material on the small cogs to reduce wear and extend the life of the cassette and chain. ED coated steel cogs are specifically designed to withstand the added force and torque of eBikes. 11t cog is constructed with hardened chromoly steel to provide durability and extend life. 42t large cog is crafted with high quality aluminum that offers strength and weight savings. Includes a steel lock ring. Compatible with standard HG freehub bodies. Item Specifications: Range: 11-42, Cogs: 11-13-15-18-21-24- 28-32-36-42, Cassette Body Type: HG, Drivetrain Speeds: 10, Color: Black, Weight: 536, Designed for ebike: Yes, Defined Color: Black,