RICHESON 9000 series Size 2" round brush This is a Size 2” round brush that is a part of the Richeson Art 9000 Series brushes. The 9000 Series brushes are composed of synthetic fibers which are designed to hold the maximum amount of paint or a small amount of paint. They are designed to be easy to grip and they give the artist excellent control. This brush can be used for watercolor, acrylic or casein applications, and these brushes are well known for their ability to hold a large amount of color and their very fine points which are easy to use, flexible in their utility and very accurate.