A tough marker for tough jobs, the Solid Slim Marker is solidified paint in a marker stick. It marks through oil, grease, rust, mud, snow and more - great for inside or outside use. Just twist the end to advance the paint when you are ready to use more. The tip offers a broad stroke and can be trimmed with a knife for smaller marks. Ideal for use on wood, cloth, canvas, plastic, steel, iron, rubber, cardboard, glass, fiberglass and concrete. Alcohol based cleaners will remove the ink from non-porous surfaces.DetailsWhite0.51" (1.30 cm) marker tipPermanentFast-drying and nontoxic