wooden . Can be modified to be made from scrap wood, pallets, etc. 1/4" 20tpi bolts. I made four holes on the lever to show the kids how leverage works. The closest dit not allow operation on mine (but too late, made it anyways!); the ratios of each (from the fulcrum) are approximately 1:8, 1:4, 1:2, 1:1. Dont give away money, turn in your own cans or melt them down.