The basics The GF Series, are flat glue brushes, made from the finest synthetic materials and are handcrafted by skilled European brush makers. GF6 (1/4″ Glue Flat), GF14 (1/2″ Glue Flat) and 1″ Glue Flat) 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.