Packages consist of 

1. Car Chasis (Acrylic)  *2 Layer
2. DC Gear Motor (EMC magentic tested) * 4 
3. Yellow Wheels * 4 
4. Fasteners * 4
5. Copper Cyclinder screw Nut
6. 3D Assembly drawing

About motor parameters:

We choose the default 48: 1 reduction ratio, measured using the code wheel (48: 1 magnetic motor) at 7.2V rechargeable battery, the travel speed of about 0.65M / S. The speed is good (for the most intelligent car use), of course, the drive voltage can be increased to improve its speed, recommended motor operating voltage is 5-10V

DC6V-120ma, DC5V 100ma or DC3V 100ma, Noise Level < 65db