The penny is put through a pair of hardened steel dies, one or both of which is engraved with a design. The penny is squished between these dies, or rollers, with 22 tons of pressure, causing the design to be impressed upon the coin. They can also commemorate events, honor people, become an accesory, or be used as advertising.
Squished pennies are no new kid on the memory-maker block.
Since then, tens of thousands of different coins have been flattened into memorable trinkets. They are mere imposters in the squishshed penny world. Though the hobby began here in America, its influence has been felt worldwide. It is this transcultural appeal that has allowed the squishing to occur worldwide. Like the hobby, the penny hasn't remained stagnant over the years either.