Each Posca pen contains non-toxic water based paint. Posca markers can be used on metal, wood, glass, plastic, plaster, canvas, fabric and much, much more! They are non permanent and removable from non-porous, sealed surfaces like glass, plastic and acrylic. The opaque, water-based acrylic paint is non-toxic and acid-free, odorless, light-fast, Xylene-free, lead-free and waterproof when dry. The PC-3M fine bullet tip marker is great for both coloring and writing clean lines. This versatile marker can be used to customize, create, decorate or mark anything that inspires you.