Shimano CS-HG50 9-Speed Cassettes Features: a Nickel plated finish for corrosion resistance a Drilled cogs for weight savings a Nickel plated steel lockring Specifications: Type: Cassette Speeds: 9 Speed Drive Type: Shimano/SRAM Color: Silver Weight: 435g (11-30T), 234g (12-25T), 256g (14-25T) Sprocket Configuration: a 11-30T: 11-12-14-16-18-20-23-26-30T a 12-25T: 12-13-14-15-17-19-21-23-25T a 14-25T: 14-15-16-17-18-19-21-23-25T