Aluminum Alloy Wheel Hub: Aluminum alloy wheel hub effectively improves the edge of the wheel hub. This material is light, high end, comfortable, with strong bearing capacity and has no noise during operation, so that you can fully enjoy the fun of riding. Good Heat Dissipation: The controller shell is made of premium metal material and has slot design, which has good heat dissipation and can avoid thermal overload of internal circuit. Practical Meter: When riding a bike, the multifunction meter will display many useful data on your bike, such as switch buttons, light switches, battery ...