Often referred to as The Gunsmith 's Brush, ProA Shot's Tornado brush has a special spiral-wound design that's highly effective for cleaning bores. The brass loops eliminate any bristle ends that could leave scratches, yet removes fouling without damaging the bore. Spiral design reaches all of the hard to get spots. Stiff bristles remove fouling but will not damage bore. Heavy duty bore brush is great for heavily fouled barrels.