Montana's fine tip (2mm) ACRYLIC Paint Markers contain high quality water-based paint made with a high concentration of lightfast pigments that cover well. It is water-proof and abrasion-proof and can be used on almost any surface, indoors and out (though when using outdoors it should be varnished). The paint is safe to use, it is solvent-free, ACMI approved and each marker carries the AP mark of non-toxicity. Each marker features an optimum flow control pump-valve system that allows for accurate handling and application. The body of the marker is transparent so you can easily see if it needs to be refilled. Refills and replacement tips are available separately. The Montana Acrylic Marker "A" Set of 12 Fine Markers includes: shock yellow, shock orange, shock red, shock pink, shock lilac, shock blue, shock green, shock brown, shock black, shock white pure, outline silver and iron curtain.