His rings are possibly magnetic and he is using fake coins made of metal, for today's currencies are made with non-magnetic metals. However, the glass on that table could also be trick glass. Notice the Magician
wiping the glass before he attempts to pass his arm through the glass but covering the secret with the other. The same kind of glass trick scenario was achieved by Criss Angel when he passed his whole body through solid pane of glass.
Criss Angel
However, the mystery is over once you know how the trick was done.
Here's a video that reveals how some of those coin tricks are done.
[url="http://www.youtube.com/watch?v=35pvoBtK4pU&feature=related"]http://www.youtube.c...feature=related[/url]
Enjoy!