The Hoppe's #9 Black Powder Bore Cleaning Solvent is made especially for black powder shooters. It lubricates as it cleans fouling from the bore and protects against rust and corrosion. The Black Powder Bore Cleaning Solvent is equally effective for deep or shallow grooved barrels. Lubricates as it cleans fouling from the bore Protects against rust and corrosion Equally effective for deep or shallow-grooved barrels