General rules for building your car:

1. Width can not be more than 2-3/4 inches.

2. Length can not be more than 7 inches.

3. Keep it under 5 ounces.

4. No wheel bearings, washers, and bushings.

5. No lubricating oil. Axles CAN be lubricated with powdered graphite or silicone though!

6. The car can’t ride on any kind of spring.

7. The car must be free-wheeling, with no starting devices.

8. No loose materials of any kind are allowed in the car.

Otherwise, get creative and have fun!