Thompson Center's Number 13A(R) Bore Cleaner is the industry standard for muzzleloader cleaning and has been the trusted bore cleaner for years. It features an all-natural formula which contains no petroleum based additives and is compatible with the Natural Lube 1000 Plus(TM) Bore Butter. Number 13 will quickly, easily and efficiently remove all residue and powder fouling in barrels without eliminating the seasoning which has coated the surface of the bore. Number 12 is non-toxic and FDA food grade rated. No 13 Bore Cleaner makes the task of cleaning a muzzleloader a lot more enjoyable. Mfg: Thompson Center