This is a very old magical puzzle. It is a small conical-shaped plastic tube. It has a rubber band sticking out of one end. There is also a small plunger with a notch on its end. The idea is to insert the plunger into the conical tube and attach the plunger to the rubber band with the notch. The magician can do the puzzle with ease. It is impossible for the spectator to do so. This is a great item for the curiosity seeker or beginning magician. 001NUFSNAPPER