POSCA PC-3M Uni Posca markers are famous for the ability to write or draw on any surface including paper, photos, plastic, metal, glass and wood. This pen set features opaque ink which is water-based, lightfast, waterproof and non-toxic. The ink is removable on nonporous surfaces like glass but will be permanent on porous surfaces like paper. They show up well on both light and dark surfaces. After drying, you can cover it with another Posca marker without any problems. 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. This size nib is perfect for detailing 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.