Mental Four Transposition. DESCRIPTION Performer shows two small packets of cards, one RED back and the other, BLUE back. Spectator is asked to mentally select one of the black 4’s from the blue pile and one of the red 4’s from the red pile. When the performer spreads the two piles, the two face up cards are just the ones thought of by the spectator and surprisingly the two cards also have their opposite backs. Finally when the remaining cards are turned up …they are all BLANK for a stunning climax!! Rs.249./- SEE DEMO THE LINK............ https://www.youtube.com/watch?v=30a4donGHSc