These POSCA Paint Markers have 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 when used on glass. The marker has 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. This marker is the multi-puprose member of the POSCA range and is a favourite of both professionals and beginners. It produces neat and precise lines, making it ideal for colouring and drawing. The colours included in this pack are white, sunshine yellow, apricot, light pink, coral pink, lavender, light blue, and aqua green. There are 8 markers in this pack. These markers are permanent on most porous surfaces and can be removed from glass.