Copper disc. These are really nice circular discs which can be used for engraving talismans onto, engraving spirit seals, or other similar designs. These are very useful for when you wish to create your own magical items. I recommend first practicing on some scrap metal before using the perfect looking disc though. Copper is most often used for Venus, or Dukes of the Goetia, or Venus pentacles for the Greater Key of Solomon talismans.