The Pro-Shot Benchrest Quality Bore Brush is designed for competition shooters to withstand frequent use. Construction consists of a high quality brass core and coupling with bronze bristles. The Pro-Shot Benchrest Quality Pistol Bore Brush is exceptional for bore cleaning with superior cleaning ability and it will not harm the bore. The Pro-Shot Benchrest Quality Bore Brush has a specific size for each caliber with each brush being oversized for extended life.