A revolutionary switching device that fits in your pocket.
Black Door allows you to force whatever you want in the cleanest way possible. Hands off. You put a bill, a card, a piece of paper inside the envelope and you hand it to the spectator. The switch is done.
You can now perform all your favorite effects without any effort.
Please be aware that due to your computer monitor display the color may have some difference between the picture and the physical item
Please according to you to buy the dress fabric, select the corresponding fabric color chart
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