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