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. This marker has an extra-fine, calibre nib that measures 0.7 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 colours included in this pack are white, sunshine yellow, apricot, light pink, lavender, light blue, glacier 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. The calibre tip, with a metal ring, has the same qualities as a pain marker in pen form.