These posca pc-3m poster markers have water-based pigments that can be blended when wet or overlaid when dry. They have a fine bullet tip which lets you draw lines that can be read from a distance. The ink produces opaque results that won't fade over time. The markers have a fine bullet tip that measures 1.3 Mm. These markers can be used on a variety of surfaces like glass, metal, wood, cardboard, and paper. The ink is non-toxic and has a water-based formula. With the comfortable, round barrel, they are easy to use for long periods. The markers can be used to customise, create, decorate, or mark anything that inspires you with a precise and steady line. The colours included in this pack are black, white, gold, and silver. There are 4 markers in this pack. These markers are permanent on most porous surfaces and can be removed from glass.