To mark easily on tough surfaces, use C.H. Hanson's El Marko® Traditional Blue Lumber Crayon. This crayon creates distinct and readable marks, and works perfectly with wood or concrete. Extend the life of your crayon by investing in Crayon Armor, the best casing to protect your lumber crayons.

• Non-toxic
• Waterproof
• Marks on wood, metal, and concrete.
• Measurements: 1/2" wide x 4 1/2" working life with Crayon Armor®
• .Boxed 12.Hexagon shape, Blue