Features:High performance 11-speed Dyna-SysII 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 controlLargest sprockets are mounted on lightweight alloy carriers to reduce weight and increase rigiditySprockets are cut away and drilled to further reduce weight without reducing rigidityLight and durable 40/42T sprocketsChrome-plated finish offers hard wearing resistance to corrosionAlloy cassette lockringFor 11-speed HG-X11 MTB chains