To make this mouse trap car you will need 4 discs, tape, 2 pens, some string, 4 hooks, and a mouse trap.
First take the tape and wrap it around the edge of all discs to create better traction.
Next take the hooks and put two of the hooks in the front and the back of the mouse trap.
Next tie one end of the string to the center of the pen and the other end to the hammer of the mouse trap.
Then take the tape again and wrap it around the ends of both of the pens, then put the discs on the ends of the pens.
Finally take the mouse trap and attach the hooks in the front and back of the mouse trap and attach it to the two pens.
This next step is optional you can add an arm to the hammer of the mouse trap by using a long piece of plastic and attaching it with some tape.