These brushes are made with a blend of 3 different diameters of high quality synthetic fibre to enhance water & color-carrying capacity for clean, even brush strokes. The life of this brush surpasses that of the hair brush considerably, especially when working on rough surfaces, and will maintain their shape after vigorous use. The extra long One Stroke bristles are great for large areas and well controlled linework. They are made according to certified green manufacturing with sustainable wood handles and rust resistant silver ferrules.