The extra-soft, soft and medium charcoal pencils in this set will produce a shiny black, smudge-proof stroke. These water-resistant pencils work in excellent combination with traditional charcoal and all types of water media when a permanent line is needed. Details:CharcoalIncludes extra soft, soft and medium hardness grades12 packs (3 pencils per pack, 36 total pencils)Wood exteriorOil basedPerfect for drawing deep, black lines