Folding Quarter - Coin in bottle, bite coin

The folding coin gimmick allows you to do classic tricks like the coin in the bottle and the bite out coin you saw on the David Blaine special.

This specially machined coin is made from a real quarter.  It folds in two places, becoming small enough to fit into a beer bottle, or inside the cap of a sharpie marker!

As opposed to a half dollar, a quarter is a coin you see every day so it's easy to borrow one and switch this in.