<ul><li>For use on oily, slick, wet, cold, or dry surfaces.</li><li>Ideal for marking lumber, concrete, ceramics, rubber, metal, paper, and cardboard.</li><li>Wax-based crayons are non-toxic and waterproof.</li><li>Marks are weather-resistant.</li></ul><br><br>For use on oily, slick, wet, cold, or dry surfaces. Ideal for marking lumber, concrete, ceramics, rubber, metal, paper, and cardboard. Wax-based crayons are non-toxic and waterproof. Marks are weather-resistant. IRWIN Tools STRAIT-LINE Lumber Crayons, Yellow (66406)