Features: 1. 2Pcs 12V Kids Ride On Bike Electric Car Motor Gear Box 550-30000RPM. 2. High torque and low noise. 3. High strength and wear resistance. 4. Rear motor gear box spare part replacement for electric ride on car. 5. Used in cars, remote control cars and motorcycles, ATV, karting, children vehicles and other modifications. Specification: Product Name: Electric Motor Gear Box; Type: Battery Bikes / Rides Ons; Material: Metal + Plastic; Battery Voltage: 12V each motor; Speed: 550-30000 RPM; Full length: 19cm / 7.5inch(Approx); Color: Black + White; Application: For Kids Electric Bike Bicycle; Quantity: 2pcs. Note: 1. We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need. 2. Please allow 0.5-1 inch difference due to manual measurement. (1inch=2.54cm) 3. The instruction is not included in the package.Professional installation is Highly Recommended. Package Included: 2 X Motor Gear box; 2 X Motor line.