Feature: 1. Easy installation, reliable quality and stable performance. 2. Help to improve the overall performance of the RC car, easy to install, flexible and sturdy. 3. Light weight does not increase the burden on your remote control car, and is easy to install and remove. 4. Good replacement of old or damaged motor gears for perfect assembly. 5. The perfect accessory for Wltoys 144001 1/14 RC model car upgrade accessory. Specification: Condition: 100% Brand New Item Type: RC Car Accessory Material: MetalOptional Color: Silver, Black Teeth: 27T Shaft Hole Diameter: Approx.3.2mm / 0.1in Size: Approx.20 x 20 x 10mm / 0.8 x 0.8 x 0.4in Compatible: for wltoys 1/14 144001 RC car upgrade accessories.. Package List: 1 x Motor Pinion Gear1 x Screw Note: 1. Manual measurement, please allow 1-3mm error, thanks for your understand 2. Due to the differences between different displays, the pictures may not reflect the actual color of the item.