The Box Three cassette allows fine tuning the price point of the Prime 9 drivetrain by accepting a small amount of additional weightSteel cog and spider construction for improved durabilityUltra-wide ratio with consistent progressionCompatible with HG freehub bodiesIntended for use with Box Prime 9 drivetrains only - may not be compatible with other 9 speed drivetrains11-46t9sp11-13-15-18-22-28-34-40-46BlackUPC/EAN/GTIN: 639266097358