The shimano hg200 7 speed cassette 12 28t a great value 7 speed cassette with hyperglide sockets and a corrosion resisant lockring shimano hg200 7 speed cassette 12 28t features great value 7 speed cassette hyperglide sprockets have a computer designed tooth configuration with contoured shift gates resulting in a crisp smooth shift even under load corrosion resistant steel cassette lockring for 7 speed hg chains