Hoppe's No. 9 Phosphor Bronze Brush, .45 Caliber Pistol Stout bristles for efficient cleaning Soft and washable Multi Directional scrubbing action Phosphor bronze bristles harder and stiffer Corrosion and fatigue resistant The Hoppe's No. 9 Phosphor Bronze brush is most effective on lead Stout bristles allow for an efficient cleaning. Designed for use with .45 caliber pistol