Pro Shot .40-Caliber/10mm Pistol Gunsmith Tornado Bore Brush The Tornado Brush has a special spiral-wound design that's highly effective for cleaning bores The Brass loop eliminate any bristle ends that could leave scratches, yet remove fouling without damaging bore Spiral design reaches all of the hard to get spots Stiff bristles remove foiling but will not damage bore Heavy duty bore brush is great for heavily fouled barrels