The numbers on artist brushes represent both the diameter of the hairs on the brush as well as the length of the hair. And, most artist brush manufacturers adhere to the same standards, so a size 2 round brush will almost always be 3/32" in diameter and 7/16" long no matter who made the brush. Flat brushes also conform to a number system, but instead of diameter, width is measured. So a size 2 flat art brush is 7/32" wide with a 1/2" length. In the studio, it may sometimes be difficult to see by eye the difference between a 00000 brush and a 0000 brush, so being able to read the brush size on your brush can make it easier to pick out the right tool for the effect you need.
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