#500 Lumber CrayonsAlso known as layout chalk or "keel". Clay-based formula provides longer marking mileage than most lumber crayons. Shape fits the #109 Peterson holder, #106 holder and #108 holder. Weather-resistant, fade-resistant marks. Lead-free. Applicable Materials: Concrete, Wood, Most Metals, Plastic, Rubber, Paper, Cardboard, Ceramic, Lumber, Plywood; Applications: Multi-Purpose; Color: Fluorescent Orange; Diameter: 1/2 in; Flash Point: 350.00 °F; Length: 4 5/8 in; Quantity: 12 per box; Resistance: Weather, Water; Specific Gravity: 1.0000 [Min]; Temperature Range: -20.0 °F [Min], 150.0 °F [Max]; Type: Marking Crayon; Weight: 0.08 lb.