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When you rub the surface of the stick against a card, it will act as roughing fluid does, only better. The cards stay together in roughed pairs, yet are more easily separated without fumbling whenever you want. The stick leaves NO RESIDUE, and with the roughing stick supplied you can create at least 150 Invisible Decks! This is, for all purposes, a LIFETIME supply. The best part? It's so inexpensive.