About this item 5123 Maestro 2 Hog Bristle Bright Set (Sizes 2, 4, 6, 8) brushes for Oil and Acrylic Bristles are hand shaped and interlocking for better color-carrying ability Seamless, nickel-plated, brass ferrules are rust resistant Highest quality Chungking bristle is double boiled for extra spring and endurance Certified green manufacturing with sustainable wood handles from European forests.