Thompson Center Muzzleloader Cotton Bore Swab (10-32 Thread) .54 cal SPECIFICATIONS BRAND: THOMPSON CENTER CA PROP 65: YES CA PROP 65 CHEMICAL: LEAD CLEANING ITEM TYPE: SWABS MATERIAL: COTTON USAGE: MUZZLE LOADER DESCRIPTION Used to oil the bore or to apply Natural Lube 1000 Plus Bore Butter as a seasoning agent. 10-32 Thread.