Tough, durable, extruded lumber crayon. Lasts up to 10 times longer than ordinary molded wax crayons. Fade-proof, water-proof, smear-proof. Wonâ€™t melt in direct sunlight. Will work on wet (green) lumber or dry wood, metal, concrete and most other surfaces. Each crayon is individually UPC coded. Hex shaped 4-1/2â€ x 1/2â€ to fit lumber crayon holders. One dozen per box.