The Comb paint brush (sometimes called a wave brush) is similar in shape to the flat paint brush. Instead of a sharp crisp outer edge, the outer edge has a fine wave shape to it resembling the teeth of a comb. They are used to paint grasses, hair, fur, fine evergreen branches, anywhere you want fine separated lines. They can be used for short strokes as on some animals fur or long flowing strokes for human hair. They can also be used with very short sharp strokes for a textured appearance.