This is a wonderful gimmick that will allow you to perform incredible effects. A coin on the palm of your hand amazingly vanishes by simply passing your other hand over it.
A coin changes into a completely different one.
A ring stays magically suspended to another one and can even be spun around in this position.
And many more...
The changes and disappearances happen in an instant and the extraordinary thing is that the hands each time are totally "clean".