Heavy-Duty Nylon Bristles: Designed with an extra-stiff construction to speed up cleaning times. The thick bristles aggressively power through copper fouling, hard carbon, and residue while resisting structural breakdown from aggressive scrubbing or harsh chemicals.Non-Marring Design: Features a brass wire and ferrule construction that ensures it will not scratch or mar rifle and pistol barrels, making it 100% safe for fine firearms. Versatile 13-Piece Variety: This complete assortment covers common firearm calibers, with standard threads that seamlessly fit most popular cleaning rods
