SRAM Power Glide II PG-1070 10-Speed Cassettes fit Shimano-compatible freehub bodies. *SRAM 10 and 11 speed cassettes with 11 tooth cogs have the smallest cog located behind the cassette in the packaging *Steel Cogs with shiny weather-resistant finish *Largest three cogs are attached to an aluminum spider *Compatible with all 10 speed chains; use SRAM chains for optimum performance