Made to meet your demands: the Shimano SLX CS-HG81-10 10-Speed Cassette. Equipped with Hyperglide technology, which is designed for seamless interaction with compatible bike chains and consists of cutaways on the sprockets for smoother shifting. The special construction makes it particularly lightweight. Plus, the cassette is very resistant to corrosion as a result of the chrome and nickel finish, which also serves to increase the lifespan of the cassette. The Shimano SLX CS-HG81-10 10-Speed is a great addition to your mountain bike! It is only compatible with directional chains.