Montana acrylic markers feature brilliant water-based, pigmented, acrylic matte colors that are commpatible with and match the colors that are avialable in the Montana Gold spray paint range. The optimum flow control pump valve system allows accurate handling and application. The markers come in a variety of nib sizes; the extra-fine and fine nibs are the best choice for fine detailed work. The ink is lightfast, water-proof and abrasion-proof allowing application to almost any surface including canvas, wood, metal, walls and glass. The ink is also ideal for brushwork and airbrush. Acrylic refill inks are available in 25ml and 180ml bottles allowing artists to refill their pens, mix and match their own custom colors and fill a range of empty markers. For interior and extreior use.