Perform this trick right out of the box!
Watch the four coins go right through solid brass! Assemble the tube right in front of your spectator. Place a solid brass disc in between two halves of the funnel, and securely screw the halves together. Place four real quarters into the funnel- they are stopped by the brass disc from passing all the way through. But at your command, the coins pass, one by one, through the solid brass and into the spectator's hand!
Surprisingly simple to do!
Coin Funnel is precision made from highly polished metal for years of trouble-free enjoyment. And here is the demo from the manufacturer: