The Pro-Shot Patriot Bore Brushed are stiff heavy duty, red, white, and blue nylon brushes exclusively made by Pro-Shot. They will not flatten like standard brass bristle brushes which helps to remove more fouling. The bristles also resist ammonia and oil based cleaners. FeaturesStiff heavy duty red, white, and blue nylon bristlesWill not flatten like standard brass bristles brushesManufactured with solid Brass Core & CouplingStiff Colored bristles resist ammonia and oil-based cleaners Standard American #8-32 Thread