Dixon 49400 Lumber Crayons 4 1/2 X 1/2 Carbon Black Dozen
Extruded lumber crayons last up to 10 times longer than ordinary molded wax crayons. Fade-proof, water-proof, smear-proof. Won't melt in direct sunlight. Will work on wet (green) lumber or dry wood, metal, concrete and most other surfaces. Hex shaped 4-1/2" x 1/2" to fit lumber crayon holders.