The Dixon Lumber Crayon Yellow from Bon Tool is used for permanently marking wet (green) lumber or dry wood, metal, brick, concrete and most other surfaces. The hexagonal shape makes the crayon easy to hold. The extruded crayon lasts 10 times longer than an ordinary molded wax crayon and is fade-proof, water-proof and smear-proof. With a temperature rating of -20 to 150 deg F, the crayon won't melt in direct sunlight. 4-1/2" in length. Sold in packages of 12.