Cassette offers ideal combination of lightweight materials, durable construction, and precise engineering * Cassette keeps shifting smooth and easy; race-proven design and durable, satin chrome finish ensure years of hassle-free use * Steel cog and satin chrome lockring, satin chrome finish, and nine speeds; recommended for PC-991, PC-971, and PC-961 chains * Cog sizes: 11 x 21 t (200 grams), 11 x 23 t (205 grams), 11 x 32 t (330 grams), 11 x 34 t (340 grams), 12 x 23 t (210 grams), 12 x 26 t (240 grams), and 11 x 26 t (235 grams) * Includes limited two-year manufacturer"s warranty