A phosphor bronze tornado brush sized for 12 Gauge shotgun barrels. A tornado brush has its bristles in a spiral, which scrapes plastic wad residue and lead from a shotgun bore more aggressively than a standard brush. Screw it onto a cleaning rod with a matching thread, wet it with a little bore solvent and run it through the barrel several times, then follow with patches or a mop to wipe the bore clean. Brushes wear with use, so it is worth keeping a spare.