Almost any coins in this world can be placed in this coaster. You can also penetrate two coins at once, or use other objects. The surface of the coaster is made by Tyvek®, which keeps it stronger and waterproof.
Roller Coaster can do even more things when using your imagination -- it has unlimited possibilities for you to discover.
What's included in the box:
A gimmicked coaster
A regular coaster
There are already many tricks that can make a coin go through the bottom of a glass. Among the many existing ideas, using a coaster is the best solution because it allows the use of an ungimmicked glass and coin.