Specially manufactured card that holds 4 quarters flush inside the 4 holes. You can do a Matrix type effect, Lay the card down, lays flat and the 4 quarters will appear on the table when you lift the card!
Put the special card with the coins loaded in the center of the deck. Vanish 4 quarters and when the deck is cut....There are the 4 missing quarters. Many more ideas and routine will come to mind when you work with it.
This special card is a Bicycle Blue Back Card. These lack any instructions!