If you're looking for a lumber crayon to withstand some wear and tear, look no further than C.H. Hanson's lumber crayons. The no melt crayon's marks withstand temperatures up to 300 degrees Fahrenheit. It can mark lumber, metal, concrete and most other surfaces, yet it remains resistant to weather, fade and sun. Extend each crayon's life by protecting it with Crayon Armor. Holds up to 50 lbs./22.6 kg, bring on the bicep curls and shoulder shrugs Use indoors and outdoors, they fear no element