Each cleaning system comes with one or more slotted tips. Otis offers 4 different slotted tips; the small slotted tip is used for .22 – .27 Caliber firearms, the large slotted tip is used for .30 – .50 Caliber firearms, the .50 Caliber slotted tip is used for .50 Caliber rifles and pistols, and the shotgun slotted tip is used for all shotguns. The slotted tips get attached to the end of the Memory-Flex cable, and are key to creating your cleaning swab. The shotgun slotted tip comes with an internal thread, so this screws on over the end of the cable.