Features: This is a great electric motor gearbox used for children's cars. The middle gear is made of metal which is more sturdy and durable. It will make quite low noise and more wear-resistant. There are 4 types for different voltage and speed that you can choose as need. It will be a great replacement part for your broken or old ones. Specifications: Type(Optional): 6V 18000RPM, 12V 12000RPM, 12V 16000RPM, 12V 20000RPM, Total length: Approx. 16.5cm / 6.5inch Hole Diameter: 1.28cm / 0.50in Quantity: 1 Weight: approx. 270-289g Package Included: 1 x Electric Motor Gearbox Note: 1. Before purchasing, please make sure that your device model matches this product. 2. If the model is missing, please compare the size of your device with this product (allowable error) according to the measurement method in the product picture to confirm whether your device is suitable.