Set of 5 pens - 4 fibre brush pens with concentrated transparent liquid watercolour inks and a special Blender - to produce a range of diverse effects. Strong brilliant colours achieved with a special formula of pigmented dyes and gum arabic. Not waterproof when dry. Easily mixed and blended by adding water to applied colour. Suitable for a variety of media (watercolour paper; cartridge and board). For optimal colour retention store works in a portfolio.