Liquitex Professional Paint Markers use a proven ball and pump valve system to optimize paint mixing and flow. The 8 mm nib shape provides the flexibility to achieve multiple line thicknesses (line width 2mm-4mm) and the high quality replaceable nibs ensure precision control on application. With a water-based acrylic formulation, Liquitex Professional Paint Markers have been specifically developed for maximum compatibility with other Liquitex products. Versatile enough for use on almost any surface, they can be used together with Liquitex Heavy Body, Soft Body or Spray Paint and finished with a Liquitex varnish for a bleed-proof finish which is both permanent and durable. Using only the highest artist grade pigments to ensure maximum lightfastness and permanence, this broad spectrum includes the opaque colors demanded in paint markers as well transparents, fluorescents and iridescents to offer limitless creative possibilities.