This is an animated toy, a car with wheels that can turn.
A hidden internal mechanism allows the wheels to rotate.
A key to wind up the mechanism is visible on the side of the vehicle.

Color choice:
The color of the bodywork is deliberately worn and the underlying metal can be seen.
This is to suggest that the toy has been used heavily.

3D model presentation:
The presented 3D model is decomposed into distinct elements: the bodywork, a key, a front axle composed of an axle, 2 tires and 2 rims, and a rear axle with its axle, 2 tires and 2 rims.
This way, each element can be given the color of your choice.