Otis' bore brushes have a proprietary tufcor core wire that is corrosive-resistant and has a tighter twist for better bristle retention with twice the fill of other brushes with bristles right to the end.Caliber-specific brushes have the size indicated on the stem.Cleans.22-.45 caliber.Includes: (2).22/.25/.27/(2).30/.35/.38/.40/.45 caliber nylon brushes.Type: Cleaning BrushSize: Variety PackQuantity: 10 Per PackBristle Type: NylonMaterial: NylonSuitable For: Firearms