Features:
High quality 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 and drilled to reduce weight without reducing rigidity.
Nickel-plated finish offers hard wearing resistance to corrosion.
Corrosion-resistant steel cassette lockring.
For Super Narrow 9-speed HG chains.
Average weight 270 g for 12 - 23T.

These details about Shimano HG50 Cassette, which is one of 28 Shimano products in Ishop Market Place, were supplied (along with details of 1290 other products from Bromley Bike Company) on 22-May-2012.