The first Uni Posca pencils were produced in 1983 and they quickly became popular among cartoonists and artists. The pens are filled with water-based full-coverage paint. Unlike alcohol-based pencils, the color does not bleed through the paper and the colors cover each other perfectly. Posca pens work well on most surfaces including stone, glass, metal, wood and more. And the paint is water and lightfast when it dries. The many possibilities have made the Uni Posca pens popular for all kinds of creative creation, from scrapbooking and crafts to graffiti and street art.