We plan to make a 4 wheeled mousetrap car with an office chair round wheel for the front with 3 cd's for back wheels. We are going to line the cd's with double sided tape then put cross sections of balloons around them. We are going to then put the mousetrap on a ladder like frame then attach a strong elastic to the mouse trap and the back axle. We wrap the elastic around it then we set the trap off and it goes.