This is a newly designed 4-wheel car chassis, and ordinary 4-wheel drive is different from this car with rear-wheel drive plus front steering mechanism to achieve the car forward, backward and turn left and right. And professional remote control racing principle, the use of two rod through the steering servo to control the direction of the car. In addition, the steering mechanism of the rear wheel has also been changed. The aluminum fixing piece is integrally formed with the motor and the motor is tightly engaged with the drive shaft. The motor adopts the all-metal gear motor. If you pursue high speed, As long as the 25mm shaft diameter motor can be. The rear wheel incorporates two flange cup bearings to ensure a more flexible motor rotation. Because of the use of more precious metal parts (bearings, transmission gear, connecting rod, metal motor, steering cup, multi-function bracket, etc.), which is expensive, the user can compare the merits, of course, the market is also cheaper Similar to the chassis, work is not on a level of the. We only have fixed mounting holes for arduino platform, if you are other platforms, you need to punch holes or try to install. Note: The product does not include the mainboard. All-metal motor rear-wheel drive Using steering gear control car steering Steering structure with bearings, transmission loss If some parts are different, it will not affect the use of the product Colour:Photo Color Material:plastic+metal Package Contents: 1 x Robot Car Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.