Feature: 1. Applications: Customized for car modification (high speed), applicable to Children's electric toys. Buyers can know the model from the motor to ensure safe use. 2. Selected Materials: The 550 drive engine uses a high strength plastic sheet combined with a motor, made of copper and steel materials, which is sturdy and durable. 3. Quick Installation: It is a fast change wire connectors that install without soldering and allow quick installation or removal of the gear box! 4. Specification: Working voltage of this is electric vehicle motor gear box is 12V, and the motor speed is 12000RPM, come with high working efficiency. 5. Practical Accessory: A very practical replacement accessory for children's toy cars, with high matching and superior performance. Can have a better user experience. Specification: Item Type: Motor Gear Box Material: Plastic, copper, steel Gross Weight: 686g / 24.2oz Product Size: 185x94mm / 7.3x3.7in Round Hole Diameter: 13mm / 0.5in Motor Model: 12V 550 12000RPM Applicable to: Children's electric toys. Package List: 1 x Motor Gear Box Note: Please check that your car is working properly. (Whether the battery is damaged and whether the battery cable is connected properly.)