The innovative design of these SAI brush pens helped it win the 2007 ISOT Stationery of the Year award in Japan. The colors are water-soluble dyestuff ink. The Sai Brush Pens are a great combination of traditional sumi-e (Asian art) brush quality and modern brush functionality and portability. The elegant , convenient, non-messy brush for adding shading after finishing painting, easy color merging. Do watercolor paintings, sketches, comic style pictures, portraits etc. It can be used with a water brush to produce amazing gradients and effects. This set of 20 contains: Black, Burnt Umber, Dark Blue, Dark Green, Green, Indigo, Lime Green, Magenta, Pale Orange, Paynes Grey, Peach Pink, Purple, Red Rose Red, Sky Blue, Tea Brown, Ultramarine, Vermilion, Yellow, Yellow Ochre.