Princeton Artist Brush Neptune, Brushes for Watercolor Series 4750, Aquarelle Synthetic Squirrel, Size 100 A beautiful range of shapes including mottlers and quills with rich wood tones and sea glass aquarelle handles Our softest and thirstiest synthetic brush, delivering oceans of color More durable and affordable than squirrel Soft and Supple with even release of color Aquarelle is considered one of the oldest forms of painting and refers to work created with watercolor. Our Aquarelle brush, found in Neptune is comprised of a synthetic blend that performs like natural squirrel. The Aquarelle will hold a sharp edge when desired as well as both holding a delivering water and paint beautifully.