Barnes cr-10 bore cleaner effectively removes the toughest copper, brass & lead deposits.Leaves rifling clean for top accuracy and longer barrel life.Dissolves layers of corrosive carbon and powder build-up in the throat area caused by repeated exposed to extreme temperatures.*note- a barrel break-in procedure is recommended to ensure to performance and ease of cleaning.Type: Bore CleanerSize: 2 ozQuantity: 1Bristle Type: NoneSuitable For: FirearmsHazair: Yes