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This is the set of "MOUSE & VANISHING BALLOONS (MEGA SIZE)"(C7511) and "CLEAR FORCE BAG"(V5321).
With "CLEAR FORCE BAG", not only can you perform the trick for a single spectator, but you can have three spectators each sign a different card, and then proceed to burst the balloon of the chosen color for each spectator in turn.
With "CLEAR FORCE BAG", not only can you perform the trick for a single spectator, but you can have three spectators each sign a different card, and then proceed to burst the balloon of the chosen color for each spectator in turn.