1. Spare parts for 12V 550 - 30000 RPM electric vehicle motor gearboxes, suitable for children's riding vehicles. 2. Specifications: - Product name: Electric motor gearbox - Battery voltage: 12V per motor - Speed: 550 - 30000 RPM - Total length: 19cm / 7.5 inches (approx.) - Color: Black + White - Material: Metal, plastic - Type: Battery - powered bicycles/riding vehicles - Use: Children's electric bicycles - Quantity: 2 pieces 3. Features: - Two 12V motor gearboxes for children's riding bicycles and electric vehicles with a speed range of 550 - 30000 RPM. - High torque and low noise. - High strength and wear - resistance. - Spare parts for rear - mounted motor gearboxes for replacement in electric riding vehicles. - Used for cars, remote - controlled cars and motorcycles, all - terrain vehicles, go - karts, children's vehicles, and other modification parts. 4. Package includes: - 2x motor gearboxes (a pair) - 2x motor wires 5. Notes: - Please check as much as possible to ensure that this item is what you need. - Due to manual measurement, a difference of 0.5 - 1 inch is allowed. (1 inch = 2.54 cm) - The package does not include an instruction manual. Professional installation is strongly recommended.