Bore Tech's double wound Proof Positive Nylon Brushes are known for being the finest brushes available. This is sue to superior construction and engineered features incorporated into the brush. They have twice the amount of bristles compared to he competition, resulting in soluble the "scrubbing action" and faster cleaning. These brushes feature over sized bristles for extra rigidity and non-brass cores and couplers which prevent the false indication of copper fouling remaining in your bore. This attention to detail is necessary to produce an effective, long lasting, high quality Proof Positive Nylon Bore Brush for your rifle or pistol.