Black and White Surprise

In one hand the magician has a white chip, in the other hand a black one; both hands are closed and the chips then change color. The same is repeated with a card between both chips: again, they change color. The spectators think they have seen everything: on one side the chips are white and one the other side black. The magician shows the chips from both sides one last time. Now one chip is green and yellow, the other is red and blue. Includes instructions. Some wear, else in good condition. A deluxe brass version.