The basics NF Series - NF8 (Flat 3/16″ Shading & Lip), NF10 (Flat 1/4″ Shading), NF18 (Flat 1/2″ Shading) and NF20 (Flat 1″ Foundation) are flat filbert brushes made from the finest natural Kolinsky Sable. The benefits The handles are matte and faceted for dexterous control of the brush. The uses All of the different series of Skin Illustrator Pro Brushes come with the same ergonomically designed handles which fit very comfortably in all hand sizes and they wont roll off of your makeup table. The bottom line The fibers are set into seamless nickel ferrules and made with solvent resistant base paint and adhesives for a legacy makeup brush.