Bicycle deck with grey back. You can use these cards for color changing effects, but you can also use them as an ordinary deck. Naturally also the case is grey. The quality of the cards is usual top quality of Bicycle decks. The deck

A bill or a currency note is borrowed from a spectator, folded, and dropped into a sealed clear crystal box through a slot on the top. Hand the box out to the spectator, and he will not be able to open the box unless he learns the clever secret. But you