Super lightweight 11-speed HG-EV cassette with a rigid carbon and alloy carrier for excellent shifting even under the most demanding gear changesHyperglide EV sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under load.Key Features:Close ratio gearing allows a more efficient use of energy through finer cadence controlLargest sprockets are mounted on lightweight alloy and carbon carriers to increase rigidity5 largest sprockets are made from titanium to keep the strength high while still being lightweightSprockets are extensively cut away and drilled to further shave off the grams without reducing rigidityNickel-plated finish offers hard wearing resistance to corrosionAlloy cassette lockringFor Super Narrow 11-speed HG-EV chainsAverage weight 175 grams for 11-25 tooth