Description: Disc Hubs: 32 holes disc brake hub set (Front and Rear), with quick release skewers.Premium and Reliable: Mountain bike hub set is made of aluminum alloy and carbon fiber material, which is lightweight, wear resistant, and sturdy for long time use.Unique Design: With a 6 claw 72 sound design, each rotation emits a crisp and clear sound, enhancing your cycling experience.Good Stability: The front 2 and rear 4 bearings provide good stability and reduce friction for more efficient riding.Application: Bike Hub set is suitable for mountain bikes, 9-12 Speed. Specification: Material: Aluminum Alloy, Carbon FiberSpoke Holes: 32Front Hub : 100mmx15mm / 3.94inchx0.59inch,quick release skewer100mmx9mm/3.94inchx0.35inchRear Hub : 135mmx12mm / 5.31inchxx0.47inch,142mmx12mm/5.59inchx0.47inch, quick release skewer 135mmx9mm/5.31inchx0.35inchFront 2 rear 4 super moisture low damping, 6 claw 72 rings ratchet full tooth base Package Includes: 1 Front Hub1 Rear Hub1 Front Quick Release Skewer1 Rear Quick Release Skewer1 Gasket Washer 6 Quick Release End Caps