These intensely pigmented acrylic-based inks are waterproof when dry and generally lightfast. They are compatible with acrylics and are excellent for use with technical pens, airbrushes, dip pens and traditional brushes. They work well on most surfaces. Each set includes six 1 oz. bottles. The Neon Set includes fluorescent yellow, fluorescent pink, fluorescent orange, fluorescent blue, fluorescent red and fluorescent green and one empty paint marker.