Wheel diameter is about 6, bottom plate thickness is about 3, length is about 25, and width is about The chassis has the following advantages: 1. The mechanical structure is simple and easy to install. 2. Four deceleration DC motors are used for flexible rotation and good directionality. Four-wheel drive, with sufficient horsepower. The chassis is large and stable, very easy to expand You will receive: 4 wheels 4 motors 2 acrylic bases And fixing parts