Uni POSCA PC-5M water-based pigment ink marker. Writes on virtually any surface with no bleed through on paper. Polyester bullet-shaped nib writes a 1.8 - 2.5mm 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 doe