1 Each of these 20 Series Brushes: Size 3 - Head Width 1/2 (12.70mm) Size 2 - Head Width 13/32 (10.31mm) Size 1 - Head Width 5/16 (7.93mm) Size 0 - Head Width 1/4 (6.35mm) Size 00 - Head Width 7/32 (5.55mm) America s NO.1 Selling Striper-Best for All Around Work! 20 Series - Squirrel Hair SWORD Stripers America s NO. 1 Selling Striper and Touch-Up Brush The Sword Style is best for all around work Lacquer & Enamel Resistant Made in U.S.A. in 7 sizes: # 00 thru # 5 Regular Length Of Hair: 2 inches or 5.08cm