1、The middle gear is a metal gear, and the motor is thickened copper wire, so that coexist power and speed 2、Possess stable working, gears are more wear‑resistant and can be used for a long time 3、The product come with easy installation, strong interchangeability, very practical and convenient 4、Adopt ABS and alloy material, possess impact resistance, suitable for motor gear box of children's cars 5、Working voltage is 12V, motor speed for 6600RPM, come with high working efficiency 1 x Electric Motor Gear Box Item Type: Electric Motor Gear BoxMaterial: ABS, alloy, copperPurpose: Motor gear box for children's carsWorking Voltage: 12VColour: WhiteMotor Speed: 6600RPMHole Diameter: Approx. 11mm / 0.4inTotal Length x Width: Approx. 140 x 80mm / 5.5 x 3.1inMotor Diameter: Approx. 28mm / 1.1inHow to Use: 1. Easy to install, pay attention to the lubrication of the gear box to prolong the service life. 2. After the gear box is installed, it should be flexibly rotated manually without jamming, and the contact spots on the tooth surface should meet the requirements of technical conditions. 3. According to the requirements of the manual, add the specified oil to reach the oil mark scale, and run it without load before formal use. At this time, the gear box can be driven by the motor. After inspection, the gear box runs smoothly, without shock vibration and abnormal noise, and is lubricated. Only when the condition is good and the sealing and joint surfaces do not leakage oil can it be put into trial operation together with the unit.