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.
That’s why Roller Coaster was born. It’s easy to carry, easy to use, and it’s a real coaster you will use in real life.
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.