3-Pack of Muzzle-Loaders Cotton Bore Swabs designed to oil your rifle's bore or to apply Natural Lube 1000 Plus Bore Butter as a seasoning agent. The muzzleloader bore swab is designed to fit .54 caliber barrels. The 100% cotton swabs are furry soft, yet durable with 10-32 threading that will fit most ramrods on the market. The Muzzle-Loaders Cotton Bore Swabs are the tool of choice for cleaning and seasoning your .54 caliber Muzzleloader barrel. Your Muzzleloading cleaning chores just got easier.