To avoid placing the wrong order. Please confirm that the product size is what you want before placing an order. 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. 36V 250W;36V 350W;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. Scope of application: Electric bicycles, scooters, twist bikes, beach bikes, tricycles, etc. Voltage and power:36V 250W; 36V 350W; 48V 250W. 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.