SRAM PG-1170 CassettesSRAM 10 and 11 speed cassettes with 11 tooth cogs have the smallest cog located behind the cassette in the packagingItem SpecificationsWeight251gIntended UseRoadCassette SpacingShimano/SRAM 11Cassette Body TypeShimano/SRAM 11Cassette Cogs11,12,13,14,15,16,17,19,22,25,28Number of Speeds11Chain CompatibilitySRAM 11Range11-28 SRAM PG-1170 11 Speed Cassette Cassettes UPC: 710845728242