POSCA™ opaque felt tip markers can write on a variety of surfaces including plastic, metal, wood, glass, plaster, canvas and more. Paint can be scraped off from nonporous surfaces like glass, but will adhere permanently to porous surfaces such as wood and paper. Water-based pigment ink is non-toxic, light-fast and waterproof. The ink won't bleed through paper (unlike alcohol-based markers) and is excellent for vibrant signs and craft work. Marker Ink Type: Permanent; Marker Tip Type: Bullet; Marker Tip Size (text): Medium; Marker Color(s): Assorted.