For 8-Speed system drivetrainSuper Fluid Drive technology for smooth shiftingNumber of Teeth (OPTIONAL): 11-32T or 11-34TGear Combination(OPTIONAL): 11-13-15-18- -21-24-28-32 or 11-13-15-18- -21-24-28-34Light Weight HolesSpacer Material: Engineering PolymersSprocket Material: SteelLock RingWeight: 334 g (32T), 346 g (34T)