Hoppe's No. 9 Phosphor Bronze Brush, .338 Caliber/8mm Rifle 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 .338 caliber/8mm rifle