Ride wherever you want with the Shuriken Master Cassette Sprocket. The Master Cassette gives cyclists all the things of a climbing range with an upgrade to body wheels. It kicks off all the cassettes on the market. New shifting parameters improve both in and out shifting. Shuriken Master Cassette Series (10 Speed 50T) Cassette Sprocket Material, 300 degrees Heat-treated, high-grade tool steel provide durability and a quality finish Held together using high-strength steel pins. Cog construction has been engineered to run with all parts of the chain, which allows exceptionally clarified shifting for both in and out shifting. The result is accurate and tough shifting performance in any situation, for even with full motor engagement.