Hoppe's No. 9 Phosphor Bronze Brush, 16-Gauge Shotgun 100 percent designed and tested For the toughest situations and environments Stout bristles allow for an efficient cleaning Firearm is clean and effectively maintained Heavy duty and trustworthy materials The Hoppe's No. 9 Phosphor Bronze brush is most effective on lead Stout bristles allow for an efficient cleaning. Designed for use with 16-gauge shotgun