Invisible Addition by Magic by Ariston.

Exclusive Digital Magic Products for Magicians

“Invisible Addition” is a custom-made case that allows you to add up to 13 playing cards to the deck without anyone noticing a thing. That’s up to a full suit of cards that can be added face-down on the top or even face-up on the bottom. 100s of card magic tricks are made possible depending on the cards you add.

The handling is super easy. They even get to shuffle the cards at the beginning if you’d like.

Every card magician needs “Invisible Addition” in their arsenal. It’s the best tool for adding cards.