Features:Made of premium material, high strength, strong structure, durable in use. Exquisite workmanship, smooth metal surface without obvious scratches. High moment of force, strong power, stable rotating speed. Compact size and light weight, low noise and stable performance. Suitable for toy car, children motorcycle, etc. Specification:Model: RS550Voltage: 6VRevolution: 550-8000, 550-10000, 550-12000, 550-18000, 550-20000, 550-14000 (Optional)Motor power: 35W - 55WMotor total length: 8cm / 3.1inMotor width (diameter): 3.7cm / 1.5inBottom diameter: 3.5cm / 1.4inMounting hole: 2.5cm / 1inMotor shaft: 0.3cm / 0.1inPackage List:1 x Motor with Two Tooth HeadsNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.