Working catapult model that uses dental rubber bands for it's power. Fully assembled and easy to use; simply load your 14 mm projectile (included), pull back, and fire! Great for army men wars or whatever. As I have not yet printed this model online (only at a local makerspace), I'm not sure just how well it will turn out. 5/8 in. dental rubber bands work well. Tab on arm is for easy firing... enjoy!