High performance Hyperglide&plus 12-speed Road cassetteHyperglide&plus 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 a lightweight alloy carrier to reduce weight and increase rigiditySprockets are cut away and drilled to further reduce weight without reducing rigidityNickel-plated finish offers hard wearing resistance to corrosionPearl-bright steel cassette lockringFor Super Narrow 12-speed Hyperglide&plus chains