1、Aluminum Alloy: Made of high quality aluminum alloy material, the rear disc hub has compact structure, high strength, wear resistance and corrosion resistance. 2、CNC Process: Using CNC cutting technology, the rear hub has high accuracy, stable performance, and it can give full play to the maximum performance during use. 3、Anode Technology: The hubs are all made of anode process, which can provide excellent anti corrosion effect, improve wear resistance, electrical conductivity, reflectivity and enhance aesthetics. 4、Main Features: With 4 rear bearings and 32 holes, and the rear disc hub has specification of 135x12mm / 5.3x0.5in, it will certainly meet your needs. 5、Perfect Accessories: Very perfect mountain bike accessories, the bicycle disc brake hub has strong practicability, high reliability and long service life. Item Type: Mountain Bike Rear Hub Material: Aluminum Alloy Spoke Hole: 32H/14G Bearing: 4 Rear Bearings Color: As Pictures Shown Weight: Approx. 385g / 13.6oz Rear Hub Size: Approx. 135x12mm / 5.3x0.5in Standard washer with a thickness of about 3mm, can support 9-12 speed flywheel after use 2 x Barrel Shaft End Cap 1 x Rear Hub 1 x Quick Release Skewer 2 x Quick Release End Cap 1 x Gasket