Hopper Tornado brush has a special spiral wound design that's highly effective for cleaning bores. The stainless steel loops eliminate any bristle ends that could Leave scratches, yet removes fouling without damaging bore. Hoppes cleaning swabs are 100 percent cotton. HOPPE'S cotton swabs are soft and will not scratch smooth shotgun bores. Hoppes tynex brushes/hoppe phosphor bronze brushes will handle most cleaning jobs and built-in "memory" returns bristles to original shape. Tynex allows unique scrubbing action for thorough cleaning.