Steel disc. These are really nice circular discs which can be used for engraving talismans onto, engraving spirit seals, or other similar designs. Thiese 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. Steel is most often used for Mars and martial work, some variety for an alternative metal for many Demons of the, or Mars pentacles for the Greater Key of Solomon talismans.