Made of good quality material, and practical to use. Used to replace the electric bicycle HUB motor. Support for Rotor flywheel. Good compatibility , support for 48V 250W. Easy to use and install, Good compatibility. Product type: High speed motor. Name: Rear Drive Brushless Toothed Electric Motor. Material:Metal, for copper. Rated Efficiency(%):>=80. Scope of application: Electric bicycles, scooters, twist bikes, beach bikes, tricycles, etc. Please allow 0.5-1cm differences due to manual measurement. Due to the light and screen difference, the item’s color may be slightly different from the pictures.