World's Fastest Gun Bore Cleaner Simply a Better Way to Clean Guns. 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, super cleans the bore. Brass weighted drop-through cord slips easily down barrel; grasp and pull the cleaning cord through the barrel. One pull through does it all. No assembly required. Lightweight and compact. No exposed metal to damage sensitive rifling or crown. Solvent compatible. Washable and reusable. - Use with: Pistols & Revolvers - Caliber: . 40, . 41 caliber