This is the ORIGINAL Free Will (wood) and not the Deluxe (metal) version.  Currently selling for $25 used online.FULL DISCLOSURE:  I really enjoyed performing this!  I always got a good reaction and was never "caught."  That said, the symbols on the back of these wooden discs are marked.  The markings are slight.  However, because they are made of wood, the wood grain pattern is different on each as well.  I always found it easier to just look at the wood grain instead of the markings.  ...