Good idea. Bad product.
The material provided is not strong enough to do the effect much less
carry it around in your pocket prior to doing the effect.
Others have said it and I agree,
I don't know how people put material on the market that doesn't even work. This is one of those
effects where you should be able to get a refund because it doesn't matter if you learned the
secret, the real secret is that it's impractical and doesn't work under normal conditions.