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Filberts

The uniquely shaped filbert brush has a curved tip that comes to a fine point capable of producing very thin lines. The stiffness of the brush, coupled with its unique curve, allows you to create a number of interesting textures. The bristles are highly absorbent and can hold large amounts of paint. Filberts are similar to flat brushes, but they have distinctly rounded tips that are ideal for creating texture.

From

Cover of 100 Things Every Artist Should Know

Note

filberts are nuts too