National Tech Labs has imbedded phosphor bronze brushes in a proprietary woven cleaning cord. The cord is constructed of highly absorbent and durable blended materials. The bench rest shooter specification brushes together with the firmly compressed "floss" cord, providing a dynamic cleaning force that will bring a bore to a mirror finish in just a few seconds. The bore cleaner can be used from the breach on all semi-automatic, break-open, bolt, lever, and pump actions and has no metal fittings to damage sensitive crowns or riflings. Has 160 times more floss than a conventional cleaning patch, is resistant to bore solvents and can be washed in soap and water.