Hello! I’m selling this Ted Bogusta “DPS” (dual position system) coin set using an American Ben Franklin half-dollar. This set has coins with magnetic properties, and does NOT use shells for a Copper Silver Copper effect. This was purchased from KranzoMagic for research purposes, and has never been used “in the real world”. Look at KranzoMagic and/or Meir Yedid’s websites for pricing guide. You will not find these anywhere else for a cheaper price!