Folding Chinese Coin Holder - Trick

The magician asks the audience if they know what he is holding in his hand. The audience obviously doesn't know that he is holding a Chinese Coinholder. The audience is now surprised, because they have never seen one before. He removes the plus and pours a Chinese coin into his palm from the little tube. The coin is much bigger than the tube. It looks absolutely impossible! The magician didn't have anything else but the tube in his hand!