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Durable 7-speed cassette. Hyperglide 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. Sprockets are cut away to reduce weight without reducing rigidity, and a nickel-plated finish offers hard wearing resistance to corrosion.Corrosion-resistant steel cassette lockringFor 7-speed HG chains