BREAK comes with 25 handcrafted, self-contained gimmicks - real coins, specifically engineered to enable this effect. The coins can be examined before and after the routine, signed, and the spectator can even keep the pieces at the end.
If you'd like to use the spectator's coins, Spidey teaches multiple ways to do that in the video - ranging from a switch (if you'd like, but not necessary for the effect) to some more devious means.
But, that said - none of that is necessary for the core effect, in which the spectator can examine the coin, sign the coin, have their mind blown, then keep the pieces to remember the moment forever. Your hands are empty and clean the whole time, with nothing up your sleeve - empowering you to focus on your presentation and performance to rock their world!