Shimano xt m771 10 speed mtb cassettethis shimano xt m771 10 speed mtb cassette offers close ratio sprockets with shimanos bespoke hyperglide design delivering crisp and precise shifting even under load this 10 speed cassette is chrome plated to resist corrosion to add longevity featureshigh performance 10 speed dyna sys cassettehyperglide sprockets have a computer designed tooth configuration with contoured shift gates resulting in a crisp smooth shift even under loadclose ratio gearing a