€¢ Extruded to last up to 10 times longer than ordinary moulded wax crayons €¢ Fade-proof, water-proof, smear-proof and won't melt in direct sunlight €¢ Work's on wet (green) lumber or dry wood, metal, concrete and most other surfaces €¢ Individually UPC coded €¢ Hex shaped 4-1/2inch x 1/2inch to fit lumber crayon holders >> 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. Each crayon is individually UPC coded. Hex shaped 4-1/2inch. x 1/2inch. to fit lumber crayon holders. Eleven colors to choose from. One dozen per box.