A white pocket knife is shown on both sides. The magician covers the knife with his hand for an instant -- and now the knife is black -- the white knife is in his pocket. Now both are used, and they magically change places. When the spectator is given a knife to examine, not only is there no gimmickry to find... the spectator is unable to open the blade of the knife -- and yet you can do it effortlessly. These knives look great, and do highly visible magic as the colors change back and forth.