Our bore mops are 100% cotton with solid brass twists and cores. These mops are used to apply solvents or rust preventative agents to the bore. They can also be used to remove excess solvents in lieu of using several patches. We clean our mops and reuse them several times. The larger sizes are great for cleaning chambers.
Sinclair, Issue:3B, Page:144
Sinclair, Issue:3B, Page:155