Pro-Shot .38 Caliber Chamber Brush Our brass coupling is made with precision threads to stay screwed into cleaning rods and will hold the brass core for long lasting tough use The Brass Core/Bronze Bristle Brush cleans the barrel completely A brass core brush holds the bristles longer and does not loosen and drop bristles out like aluminum core brushes The ends of our pistol, rifle, and shotgun brushes are looped, not sheared off like lower quality brushes All Pro Shot products made in USA from USA components