The idea is unlike any I have seen before using a prop you probably already own. Matt's description
of the effect is excellent and it has worked for me most of the times I have tried it. The BIG
problem is that you give the spectator too much control over the gimmick. I have personally had the
trick ruined twice already because of a spectator that didn't follow my directions exactly...some
people get too curious and might open their hand. I think this effect is worth no more than $10, as
you will see when you buy it, that it is nothing more than a new way to use a gimmick that is $3-$5
at the most.