Also 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. Color(s): Fluorescent Orange; Crayon Size: 1/2" x 4 5/8"; Temp. Range: -20F to 150F; Applicable Material: Cardboard; Ceramics; Concrete; Glass; Metal; Paper; Plastic; Rubber; Wood.