Able to outperform Kolinsky Sable brushes when it comes to water absorption, the Neptune Series 4750 Watercolor Brushes by Princeton Brush Company is made of synthetic squirrel hair. Refered to as today's thirstiest watercolor brush, the Neptune Series of artist's brushes has been developed with synthetic fibers that are designed to feel smooth like natural squirrel hair and surpass other brush's water hold. 

This line of professional quality watercolor brushes is available in a wide range of unique shapes that are not common in other brands and features sea glass or wood handles.