The Uniball Posca PC-8K 8mm wide acrylic marker pens are available in 33 colours. POSCA pens can write on virtually any surface including glass and won't bleed through paper, making these an ideal choice for artists looking to create a range of artwork types. POSCA markers use water-based pigment ink that is lightfast and water-resistant. They are permanent on wood, textiles and cardboard, and are erasable on smooth surfaces such as glass, metal, plastic, glazed ceramic and porcelain. Use a fixative on smooth surfaces to make your designs permanent.