Shimano CASSETTE SPROCKET, CS-HG400-9, 9-SPEED, 12-14-16-18-21-24-28-32-36(BH), PRE-ASSEMBLED (CS CAP) Nickel plated steel lockring Nickel plated finish for corrosion resistance Drilled cogs for weight savings Drivetrain Speeds: 9 Shimano CS-HG400 9-Speed Cassettes