Princeton - Neptune Synthetic Squirrel - Short Handle - Aquarelle Square WashSTIFFNESS ACRYLIC WATERCOLOR OIL When we set out to create a synthetic version of squirrel, we developed a brush that may actually outperform the natural version. Neptune is our 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 in a beautiful range of shapes including mottlers and quills with rich wood tones and sea glass