Experience smoother rides and better performance with this bike hubs - perfect for high-performance mountain and road biking. Our hubs feature a CNC-machined axle for a lighter weight and ber structure. Specifications: Material: Alloy Color: Black/ Red (optional) Spoke : 32H/36H (optional) Bearing : Front 2 / Rear 4 Size: Front: 100*9mm Rear: 135*10mm Weight : 493g/ 17.4oz Package list: 1 * pair of bike hubs 1 * pair of quick release levers