When used together you can perform some of the cleanest transpositions, penetrations, vanishes and productions you could imagine. The principal is similar to that of a Chop Cup . One of the basic effects is to show the box to a contain a coin. After clearly dumping the coin out and doing a simple vanish it re-appears inside the box. This happens several times and at the end the coin penetrates both the playing card and the box.
Many routines are possible.