The Thompson/Center T-17 Pre-Saturated Cleaning Patches are 100% double knapped, cotton patches with T-17 Bore Cleaner. These cleaning patches are specifically formulated to clean and neutralize the corrosive effects of black powder and black powder substitute powders.These T-17 cotton patches are convenient to use in a re-sealable plastic jar, and you can carry them with you in the field so your rifle loading is easier. Each jar contains 100 pre-lubricated, 2-1/2" patches that fit both .45 & .50 caliber muzzleloaders.