Pocket Selbit Block Trick

Four small blocks, numbered one through four and marked with different colors, are stacked on top of each other inside a wooden tube. The blocks change positions inside the tube at the command of the magician. The magician is able to manipulate the order of the blocks with the action of just one hand. A unique prop with a method we have not encountered before as the blocks have no shells. Some wear, else in very good condition.