The Magnetapult is... a magnetic catapult! Fling projectiles with only the power of magnets!I think there are enough photos for everything to be self evident. One important thing is that if the magnets aren't tight in the holes, DON'T USE IT! The recoil when the top magnet hits the stop may be enough to push the magnet out of the hole, flip around, and come crashing against the bottom magnet! You can buy N42 (http://www.kjmagnetics.com/proddetail.asp?prod=DC6&PARTNER=cadabralabs) or N52 (http://www.kjmagnetics.com/proddetail.asp?prod=DC6B-N52&PARTNER=cadabralabs) magnets to use with the Magnetapult.This is a kickstarter project, so if you don't have access to a laser cutter (or you want to save money, time, and effort) you can back the kickstarter project and get a complete kit, along with extra tweeks and features. (I also have a Mini that packs a big bang for its size!) The kickstart project is: http://kck.st/xQap2h