Markal ProLine XT Liquid Paint Markers are specially formulated to provide exceptional marking performance on rough, rusty and dirty surfaces. Utilizing an enamel resin to provide enhanced wear, weather, and chemical resistance, these fast-drying paint markers bind quickly to a variety of materials including rusty metal, plates, plastic, glass ceramic, steel, iron, pipes, rubber, and non-ferrous metals. Free of Xylene and other harmful chemicals, ProLine XT markers leave bold, highly visible marks while reducing user health risks. Ideal for use in steel mills and warehouses, metal fabrication, automotive, construction, metal production, oil, ship building and repair industries. Made in the U.S.A.