Posca Acrylic paint markers are non-toxic, water-based, and can be used on almost any surface. Alcohol and solvent free, opaque paint covers well, is blendable, and dries quickly. For use on paper, glass, cardboard, wood, porcelaine, metal, textiles, ceramics, plastic, and more - all without priming. They can even be used like watercolor when mixed with water and a brush. The PC-5M medium bullet tip marker is the 'multi-purpose' size in the Posca range. Creates neat and precise lines, and is great for coloring and writing.