Princeton's Anglular Flat Wash is recommended for watercolors. Use it to apply and blend broad washes or layers of color. Use it also with fluid acrylics.
The hair is a thick synthetic sable that holds more color and water, has more snap, and produces a better point. This brush hair is Princeton's best synthetic sable blend, a premium hair that offers superb softness and color holding capacity along with greater snap. It has the best spring of all Princeton synthetics. It looks like sable and performs like it.
Princeton's 4050 Series brushes feature a rich, distinctive gold ferrule mounted on a dark stained hardwood handle.
Note — Brush sizes are not standardized. The length and width of a brush of a given shape and size varies considerably by manufacturer. Since fine art brushes are handmade, expect some variation even among brushes from a given manufacturer.
see also ...
™ Princeton is a trademark.