Yikes. I've never heard of Kreis Magic, but they're a Japanese company that apparently specializes in one-off, gimmicked, stunt magic. Put it this way, Tenyo has nothing to worry about.

Two quarters are placed in a very small glass tumbler. The tumbler is covered with a coaster. The glass is shaken and the two coins are seen to have changed to half-dollars. That's it. Good night. Please try the prime rib.

If you can think of a way to make this stupid effect interesting, then by all means, send me the video. The plain white "coaster" provided is the size of a condom wrapper and looks nothing like any coaster I've ever seen. The method is so transparent, that the audience is sure to go right for the coaster as the solution. And they'd be right!

Save your coin for real coin magic.