When Princeton set out to create a synthetic version of squirrel, they developed a brush that may actually outperform the natural version. Neptune is Princeton's softest and thirstiest synthetic brush, delivering oceans of color. Experts in natural hair have been incredulous that this is actually synthetic. We are proud to offer Neptune brushes in a beautiful range of shapes including mottlers and quills with rich wood tones and sea glass aquarelle handles. For Watercolor Set Contains: Aquarelle 3/4", Round 4, Round 12, Oval Wash 1/2"