These extruded lumber crayons (keel) last up to 10 times longer than ordinary molded wax crayons. Fade, water and smear proof. Won't melt in direct sunlight. Work on wet (green) or dry lumber, metal, concrete and most other surfaces. Each crayon is individually UPC coded. Hexagonal shape to fit lumber crayon holders. 4-1/2" x 1/2". Available in 11 colors. One dozen per box. Made in the U.S.A.