Features: Make of aluminum Alloys, high strength, antirust, none deformation and enduring. Comes with necessary fittings, easy to install and use. By converting your normal Hub into a Boosts Hub, this adapter set improves the performances of the bike and provide better stability and control. Light weight and do not add unnecessary weight to your bike. By converting your normal hub into a boosts hub, this adapter set improves the performances of the bike and provide better stability and control. Specifications: Component: Aluminum alloys Type: Front 100X15 to 110X15/Rear 142X12 to 148X12/Front 100X15 to 110X15/Rear 142X12 to 148X12 Size: as shown in the picture Package Includes: 1set Bicycles Boosts Hub Adapter note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.