Magnetic Cannon toy
Gently Used - Four stage magnetic accelerator assembles in minutes without tools or glue. It includes powerful rare-earth magnets, steel ball bearings, a 22cm (8.5″) long firing trough, and all the hardware needed to build your own magnetic accelerator. You can even join more than one kit to multiply the effect! This kit is an ideal centrepiece for a science project on magnetism and kinetic energy.