The SunRace CSR91 9-Speed Road 12T-25T Nickel Cassette offers cyclists a lightweight design and smooth shifting experience with the SunRace 'Super Fluid Drive' system. This bike cassette features steel sprockets and an alloy lockring, with a total weight of 293g. The 9-speed gear combination includes 12-13-14-15-17-19-21-23-25 teeth for precise shifting. A nickel finish completes the design.