The Otis In-Line Muzzleloader Micro Cleaning Kit works with today's modern in-lines and covers all modern calibers. This kit is a great complement to the Otis nipple pen. Key components needed to clean your in-line muzzleloader include two 50 caliber Memory-Flex cleaning rods, a large brass slotted tip, 45 and 58 caliber blackpowder bore brushes, 3 panoply patches, and a ½ oz. tube of concentrated muzzleloader cleaner. This cleaning system also contains a bore reflector/flag safety, a ½ oz.