Hoppe's No. 9 Tornado Gunsmith's Brush , .40 Caliber Pistol Special spiral wound design Highly effective at removing fouling Stainless steel loops 100 percent designed and tested For the toughest situations and environments Special spiral-wound design that's highly effective at removing fouling, yet won't damage your rifling Stainless steel loops eliminate any bristle ends that could leave scratches Designed for use with .40 caliber pistol