The unique Staedtler Lumocolor Omnigraph Crayon contains non-corrosive colour pigments and can be used to mark wood, paper, metal, plastic, glass, leather and stone. The crayon provides superb colour brilliancy and is waterproof for vibrant signs, artwork, crafts and more. Each crayon is 113mm in length and has a hexagonal barrel designed for comfort. This pack contains 12 black crayons.