Winsor Newton Pure Squirrel Russian Blue Squirrel Feather Tube Brush & Brush, Hair, No.6

It is made from soft and delicate squirrel hair, making it extremely easy to use. The hair is held together using natural goose quills, making the brush more flexible than brushes with metal ferrules. Its cone-shaped expansion allows it to hold a lot of paint. The very fine bristles make it easy to control the wash, making it ideal for watercolor washes. It can be used with a variety of water-based paints, including opaque watercolors (gouache).