14Pc Bronze Rifle Bore Brush Set Description Conveniently packaged caliber- and gauge-specific sets of brushes means you always have the right brush at hand. Because they are caliber- and gauge-specific, you can be assured of an optimum fit to your firearm's bore for efficient and thorough cleaning. Contained in a durable, hinged box with marked cavities, it's easy to select the correct brush for your particular application. Tipton Bore Brush Sets are available in both bronze and nylon. Bronze brushes are made from premium phosphor bronze for long life and cleaning power. The nylon brushes are made from a material that is unaffected by most modern solvents including copper solvent which can easily deteriorate a bronze brush. Threads fit most popular brands of cleaning rods. Rifle set contains 14 caliber specific brushes (17-45 caliber).