Flex-Hone tools will improve the look of your shotgun barrel, while making it easier to maintain. The unique fingers gently smooth the metal, creating a more uniform surface that resists wear, corrosion and reduces fouling. The end result is a more polished smoothbore with a beautiful finish. For smoothbores only. Notes:The manufacturer recommends the use of Flex-HoneA(R) oil for use with these hones. It is specially formulated for use with Flex-Hone hones FeaturesTwisted steel wire shaftAbrasive globules on flexible nylon filamentsWire stem and hone tip are coated with plastic to protect barrel3" abrasive section, 34" overall length