Posca pc-5m poster coloured markers are made using a non-toxic, water-based formula that produces dense, vibrant colours on a variety of surfaces. The markers are permanent on most porous surfaces and are removable on glass. The markers have a medium bullet tip that measures 2.5 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. These markers are the multi-purpose member of the posca range and are a favourite of both professionals and beginners. The colours included in this pack are black, white, gold, and silver. There are 4 markers in this pack. They produce neat and precise lines, making them ideal for colouring and drawing. These markers are permanent on most porous surfaces and can be removed from glass.