As seen performed by David Blane and alike.

The magician borrows a 10p piece from the audience, and proceeds to take a bite from it. The bitten section is then spat back into place, and the coin handed back for inspection.

A very easy to perform trick that is great to keep in your pocket and use whenever you wish. These special coins are produced for us in the UK, and come with instructions, and spares for the mechanism. Enough to keep you going for ages.