Key Features:High 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 allows a more efficient use of energy through finer cadence controlSix largest sprockets are mounted on lightweight alloy carriers to shave off the grams and increase rigiditySprockets are cut away and drilled to for a lighter design without reducing rigidityChrome-plated finish offers hard wearing resistance to corrosionAlloy cassette lockringFor 10-speed HG-X MTB chainsWeight: 323 g for 11 - 34T