Shimano CS-HG200 Acera 9-speed cassette 11-36T. Great value 9 speed cassette ideal for hybrid & city bikes as well as entry level mountain bikes. The close ration gearing makes for smoother pedalling. The CS-HG200 cassette uses Hyperglide sprockets for crisper shifting. Features Great value 9-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 & drilled to reduce weight without reducing rigidity Corrosion-resistant steel cassette lockring For Super Narrow 9-speed HG chains