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Hoppe's No.9 Synthetic Blend Bore Cleaner removes carbon, lead, and copper fouling; and is safe to use on anodized aluminum, titanium, steel, chrome, nickel, plastic, polycarbonate, and rubber. Hoppe's kept the iconic traditional No.9 smell in this biodegradable and non-flammable synthetic version. The bore cleaner is offered here in a 1-gallon jug.