Features1Fine Workmanship: Aluminum alloy rotor is light and anodized, able to ensure the quality of products, making the bike hub durable and practical, suitable for long term use. 2High Performance: Has fast response speed and uniform force, providing fantastic long term reliability and stability regardless of driving conditions. 3High Smoothness: The ultra smooth surface of the contact area enables a high accuracy, low friction sealing rotation, providing a satisfying using experience. 4Specially Designed: Has classic 6 pawls freehub system with clear and pleasant sound, efficient for trample, listening to beautiful sounds while riding can relieve fatigue. 5Aluminum Material: The bike hub is made of sturdy and durable aluminum alloy material to ensure maximum strength and durability, having good performance.SpecificationItem Type: Mountain Bike HubMaterial: Aluminum AlloyColor: Anode Glossy Black, CNC Processing Gross Weight: Approx.452g/15.9ozBearing: Front: 2 BearingsRear: 4 BearingsFront Bike Hub: Approx.100x12mm/3.9x0.5inRear Bike Hub: Approx.142x12mm/5.6x0.5inHub Body Unit: 6 Pawls Aluminum Base, 72 RingBrake Disc: Suitable for Centerlock DiscNumber Of Holes: Front 24 Holes, Back 24 Holes, Straight PullApplication Speed: for 8 Speed, 9 Speed, 10 Speed, 11 SpeedPackage List1 x Front Hub1 x Rear Hub1 x Washer