Shimano tiagra 4600 10 speed road cassettehigh quality 10 speed cassette hyperglide sprockets have a computer designed tooth configuration with contoured shift gates resulting in a crisp smooth shift even under loadfeatures 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 10 speed road hg chainssprocket sizes 11 25t 11 12 13 14 15 17 19 21 23