RS 10 Speed Road CassettesLightweight, smooth shifting 10spd. Road cassette.Super Fluid Drive shifting technology.Steel teeth with champagne colour coat.CNC alloy anodised spider.Steel lock-ring & resin spacers.Shimano/SRAM compatibleSize: 11-25T (242g)11-28T (250g)(RX-10 also available, with alloyspacers and Alloy lockring less 5g)