How is this done? I'm not asking for a reveal, I want to perform it for a thing I'm doing. I've seen magicians who are seemingly able to pull hundreds of cards from a backpalm. I know there are manipulation decks which are much thinner than normal cards and often have flesh colored backs, but are they actually back palming that many cards? Is there some sort of extra gimmick they use? If you don't think it should be revealed here, pm me.