Markal Pro-Ex Lumber Crayons are clay-based, extruded lumber crayons used to create bright marks on different surfaces in the construction trades. These premium-grade crayons work on wet or dry surfaces.

• Stronger formula for reduced breakage and longer marking life
• Superior performance on wet, frozen, or treated wood
• Clay-based formula for smooth, fast marking
• Marking range: -20°F to 150°F (-29°C to 66°C_
• Industry Uses: Construction; Stone and Masonry; Lumber and Timber industries
• Surface Uses: Wood, Concrete and stone, metal, plastic, and rubber