Dixon Log and Lumber crayons have set the standard for industrial marking crayons. These extruded lumber crayons last up to 10 times longer than ordinary molded wax crayons. Fade-proof, water-proof, smear-proof, plus they don't melt in direct sunlight. Dixon crayons work on wet (green) or dry lumber, logs, metal, concrete and most other surfaces. Hex shaped 4-1/2" x 1/2" to fit lumber crayon holders. Made in the U.S.A.