Blue Lumber Crayons - 12Model: HD-600
These crayons last up to 10 times longer that ordinary molded wax crayons. Fade, water and smear proof. Won't melt in direct sunlight. Work on wet or dry (green) lumber, metal, concrete and other surfaces. 4-1/2" x 1/2". One dozen per box. Made in the U.S.A.