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My Luna-bot has a wind up wheel that was made by using a retractable close line. You can also adjust how or low the wheel is by tightening the zip ties that hold up the arms of the wheel. The body of my bot is made out of Styrofoam and is reinforced by masking tape, cardboard and lots of zip ties. I also strapped toy cars to the bottom of my treads to make my Luna-bot able to move.