Quick-change kings

Here's a super-fun and super-easy card trick for you. The magician says he has four kings: two black kings face up and two red kings face down. Mysteriously, the black kings swap places with the red kings. This is repeated a few times, then the kings unexpectedly transform into four aces!

• Printed by the USPCC on Rider Back Bicycle cards.
• Only 4 cards are used.
• Amazing, but very easy to do.
• Comes with the necessary maps and easy-to-understand instructions.