Hoppe's No. 9 Nylon Brush, .38 Caliber Pistol Nylon brush for scrubbing action The bristles return to their original shape Incredible durability for usage 100 percent designed and tested For the toughest situations and environments Use this nylon brush for scrubbing action that is multi-directional The bristles return to their original shape Incredible durability for usage Designed for use with .38 caliber pistol