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:.22 x 2/.25/.27/.30 x 2/.35/.38/.40/.45 caliber nylon brushes.Type: Cleaning BrushSize: Variety PackQuantity: 10 Pk.Bristle Type: NylonIncludes: CaseMaterial: NylonSuitable For: Firearms