Premium Quality: 20000RPM Transmission with 6V Drive Motor, RS550 Drive Motor is made of high strength plastic board and high quality motor. This electric motorcycle transmission motor is made of premium quality, the central gear wheel is made of sturdy and durable metal to ensure long service life. The central part of the transmission is made of mental with a heat dissipation shovel. [High Speed] Specially modified for stroller modification, high speed automatic modification. You can also adjust the speed, but the speed of the electric motor can only be reduced, can not be increased. Low noise and high torque. Use: The transmission is used in most children's electric wheels, suitable for cars, cars and motorcycles, ATV, karting, children's vehicles and other modifications. It is a good choice to replace the broken ones[Easy to use] Gearbox Item is easy to replace and is universal, guaranteed Exact Fit for easy installation, designed for excellent durability.[Please note] Check the size of the equipment before purchase. length: 18.5 cm, width: 9 cm, motor length: 5.7 cm, motor diameter: 3.5 cm, model: 6 V 20000 rpmDelivery quantity: 1 piece,"