Contains Non Toxic Water Base 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, lightfast, Xylene free, lead free and waterproof when dry. Will bond permanently to wood, clay pots, poster board, plaster and other porous materials.