1、Aluminum Material: The bike hub is made of sturdy and durable aluminum alloy material to ensure maximum strength and durability, having good performance. 2、Fine Workmanship: Aluminum alloy rotor is light and anodized, able to ensure the durability, making the bike hub durable and practical, suitable for long term use. 3、Specially Designed: Has 3 pawls freehub system with clear and pleasant sound, efficient for trample, listening to beautiful sounds while riding can relieve fatigue. 4、Working Performance: Has fast response speed and uniform force, providing fantastic long term reliability and stability regardless of driving conditions. 5、High Smoothness: The ultra gloss surface of contacting area enables a high accuracy, low friction sealing rotation, providing a satisfying using experience. Item Type: Mountain Bike Hub Material: Aluminum Alloy Color: Anode Glossy Black, CNC Processing Gross Weight: Approx.460g/16.2oz Bearing: Front: 2 Bearings Rear: 4 Bearings Front Bike Hub: Approx.100x12mm/3.9x0.5in Rear Bike Hub: Approx.142x12mm/5.6x0.5in Hub Body Unit: 3 Pawls Aluminum Base Number Of Holes: Front 24 Holes/Back 24 Holes, Elbow Pull Brake Disc: Suitable for Centerlock Disc Application Speed: for 8 Speed, 9 Speed, 10 Speed, 11 Speed 1 x Front Hub 1 x Rear Hub 1 x Washer