This marker has an 8mm wide chisel tip that allows superb coverage. Contains Non-toxic water-based paint. Mark on metal, wood, glass, plastic, plaster, canvas and more. Excellent for signs exposed to the weather. Great for temporarily marking up glass windows. Popular with surfboard painters. Used extensively by auto dealers to mark windows with advertisements. Also used by auto body shop estimators to map out repairs on vehicles. Markers are removable from non-porous, sealed surfaces like glass, car bodies, chalkboards. Opaque, water-based acrylic paint is non-toxic and acid-free. Odorless, light-fast, Xylene-free, lead-free and waterproof when dry. Will bond permanently to wood, clay pots, posterboard, plaster and other porous materials.