The magician shows the rod and explains that when you pull a bead at one end, the cord it is on grows longer. At the same time the cord at the other end of the rod grows shorter. This can be repeated and when the audience is convinced that the cords are joined, the magician pulls the two halves of the rod apart. However, once the two halves are joined together, the trick can be repeated. It is not possible to allow the audience to examine the two halves. Manufacturer unknown.