- High quality 8-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 further reduce weight without reducing rigidity - Nickel-plated finish offers hard wearing resistance to corrosion - Corrosion-resistant steel cassette lockring - For Narrow 8-speed HG chains Sprocket sizes - 11,13,15,18,21,24,28,34T.