[Feature] 20000/30000 RPM gearbox with 6V / 12V motor, RS550 drive motor is made of heavy duty plastic plate combined with high quality motor [High speed] Specially customized for children Car modification, car modification with high speed. You can also adjust the speed, but the speed of the electric gear motor can only be reduced, it cannot be raised. Low noise and high torque [Field of use] Gearbox is used in most childrens drive wheels, it is suitable for remote control cars, cars and motorcycles, ATVs, karts, childrens vehicles and other modifications. It is a good choice to replace the broken one [Easy Operation] Gearbox Item is easy to replace and universal, guarantees Exact Fit for easy installation, designed for superior durability, backed by industry leading warranty [Kindly remind you] Please check the gear size before purchasing. Specifications: Product length:18.5cm/7.28inch, Width:9cm/3.54inch Motor length: 5.7cm/2.24inch Motor Diameter: 3.5cm/1.38inch Model: 6V 20000RPM Motor power: 35 W Weight: 490g Package Included:1 x Gearbox