The Otis Cleaning System is a versatile cleaning system that can handle every condition. In this single, light weight pack contains the brushes needed to clean .22, .270, .30, .38, .45 cal. rifles/pistols and 12/10 gauge shotguns. The patches clean .17 to .50 cal. rifle/pistols, .410 to 12/10 gauge shotguns and all in-line muzzleloaders.