The World's fastest gun bore cleaner. This is simply a better way to clean your handgun. This is a gas gun cleaner made for 37mm and 40mm.Brushes and swabs bore in one quick pass. Built-in bore brushes.-Multiple short brushes embedded in the floss pass easily through the shortest action or port-Initial floss area (inside the barrel) removes loose grit and debris prior to the scrubbing action of the brush -Main floss, with 160 times more floss than a patch, supercleans the bore -Brass weighted drop-through cord slips easily down barrel Grasp and pull the cleaning cord through the barrelOne pull does it all! -No assembly required-No exposed metal to damage sensitive rifling or crown-Solvent compatible-Washable and reusable