Display a deck to your audience, showing both the faces and the backs of the cards. Then have a spectator choose a card and put it back into the deck. Say to the audience that your deck works as a safe, and has a secret combination.
Put the small wheel (with numbers on it) on the deck, and then ask three spectators to tell you three different numbers from one to ten. Then turn the wheel using the number told by spectators.
At this point, say that you will open the "door" of the safe in order to find the selected card. By raising the little wheel, you will show how some cards remain attached to it. Ask the spectator to take the first of the remaining cards on the table...and obviously, it will be the card he selected at the beginning!