Montana Acrylic Paint Marker Sizes: 0.7mm, 2mm & 15mm Water based High pigmentation Water proof Solvent free Shock Gravel The Montana Acrylic Paint Markers are available in a choice of 24 different colours, each consisting of highly pigmented, water based paint which is solvent free and non toxic. The Montana Markers are available in a choice of 0.7mm tips for details, 2mm tips for outlines etc and 15mm tips which are perfect for fills and larger pieces, the paint is also water proof which means increased durability against the elements.