The stacks are made from hollowed out coins being riveted to a real coin on top. Since the coins in the stack can easily be moved, it has a very natural look. If you are using the Stack of Halves, you will need five duplicate halves and five quarters. The quarters are loaded inside the stack. If you are using the Stack of Quarters, you will need six duplicate quarters and five pennies. A small die is included to load if you wish!