The bore mops are made entirely from cotton and include solid brass twists and cores. They are specifically designed for applying solvents or rust-preventive agents to the bore. Furthermore, these mops can be used to remove excess solvents, offering an alternative to using multiple patches. They are easy to clean and can be reused multiple times. Larger sizes are especially effective for cleaning chambers. Compatible with 8-32 internal threaded components Premium 100% cotton bore cleaning mop for precision firearm maintenance .22 Cal/.223 Cal bore cleaning mop