20 Gauge and caliber specific, Bore-tips are tough, reusable foam tips engineered for 100% bore contact spreading fluids more evenly than mops and patches without lint or fibers. Their non-abrasive foam allows them to be run in both directions, while their absorbency requires less solvent/lubricant. Like all Swab-its products, the 20 Gauge Bore-tips are washable and reusable. They affix to a standard shotgun rod with 5/16-27 threading. Features: A bag contains (3) bore-tips Each tip can be used multiple times and should substantially outlast a similar priced bag of patches Washable and reusable Lint-free and fiber-free