Mack 10 Series Pinstriping Brushes: Set OF 4 Brushes, Part#'s 10-1, 10-0, 10-00, 10-000; 1 Each of these 10 Series Mack Brushes: Size: 1  Head Width(Inches/MM): 5/16"/ 7.93mm, Size: 0  Head Width(Inches/MM): 3/16"/ 4.95mm, Size: 00  Head Width(Inches/MM): 7/32"/ 5.55mm, Size: 000  Head Width(Inches/MM): 1/4" / 6.35mm, Exceptional Brush, Just For Pinstripers! 10 Series - Squirrel Hair Sword Stripers (The 10 series is made in sizes 000, 00, 0, 1, 2, 3,4) 100% Unmixed Blue Squirrel Hair, Hand Crafted And Shaped As It Was Many Years Ago, Extra Attention Given To Quality Control with Respect To Shape And Cleaning, The Very Finest Grade Of Blue Squirrel, Our New Blue Thread Ferrule, Regular Length Of Hair: 2 inches or 5.08cm.