Shimano 105 R7000 11 speed  11-28T Cassette high performance HG-EV 11-speed 105 Road cassette Shimano 105 R7000 11 speed  12-25T Cassette Hyperglide EV sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under load Close ratio gearing allows a more efficient use of energy through finer cadence control Largest sprockets are mounted on a lightweight alloy carrier to reduce weight and increase rigidity Sprockets are cut away and drilled to further reduce weight without reducing rigidity Nickel-plated finish offers hard wearing resistance to corrosion Pearl-bright steel cassette lockring For Super Narrow 11-speed HG-X chains