SRAM eTAP XG-1190 Road Bicycle Cassette Cog Sizes: 11 - 25 t, 11 - 26 t, 11 - 28 t, 11 - 30 t, 11 - 32 t Cog Material: high-grade tool steel, [lowest range cog] aluminum Claimed Weight: [11-28t] 151 g Recommended Use: cycling Manufacturer Warranty: 2 years