Uni POSCA PC-7M water-based pigment ink marker. Writes on virtually any surface with no bleed through on paper. Polyester bullet-shaped nib writes a 4.5 - 5.5mm line. Uni POSCA markers use water-based pigment ink to produce poster-like vibrant colours. Writes on metal, glass, plastic, stone, etc. - virtually any surface. Non-bleed ink doesnt feather and doesnt bleed through paper, unlike alcohol-based markers. Writes on sketches, photographs and fabrics. Easily removed from glass - ideal for temporary signs on windows, windscreens, etc. Let dry after application and new ink can completely cover the previous colour.