The 14-491 Black Marking Crayons (Model 49400) are professional-grade marking tools designed for creating bold, durable marks on a variety of construction, woodworking, and industrial materials. Ideal for use on lumber, masonry, concrete, brick, steel, metal, and other jobsite surfaces, these marking crayons provide clear, easy-to-see markings for layout, measuring, cutting, fabrication, and installation tasks. The black marking color delivers excellent contrast on lighter surfaces, making it a dependable choice for contractors and tradespeople. Sold in a convenient pack of 12, these crayons are suitable for construction, masonry, carpentry, fabrication, and general industrial applications. Material: Wax.