Updated design shaves grams of Shimano's previous 9-speed cassette with machined holes on larger cogs. The redesigned spider firmly holds sprockets for incredibly stiff performance. High mileage nickle plated steel construction. 11-32t (11, 12, 14, 16, 18, 21, 24, 28, 32) or 11-34 tooth (11, 13, 15, 17, 20, 23, 26, 30, 34).