SHIMANO XTR CS-M980 10 Speed Cassette Trail optimized 10-Speed Cassette from Shimano's XTR line of components 3-piece spider arm construction is light and rigid 5 largest cogs are made out of titanium for lightweight durability 11-34 cog set includes: 11-13-15-17-19-21-23-26-30-34 tooth cogs 3-year warranty