Features: Make of aluminum Alloys 6061 materials, 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. With this adapters, you can change 100x15mm front Hub into 110x15mm, or 142x12mm rear Hub into 148x12mm. Specifications: Materials: Aluminum Alloys 6061 Style: Front Gaskets/Rear Gaskets Size: Front 15x100mm To 110mm / Rear 12x142mm To 148mm 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.