Designed from the ground up to do a better and faster job of cleaning guns. Micro Bristles stay rigid under pressure providing superior scrubbing power. Four unique brush shapes with integrated scrapers are designed to specifically clean hard-to reach interior and exterior surfaces where carbon and gunk accumulate. Features: 4 unique brush shapes in phosphor bronze Carbon busting micro bristles 4 scraper tips remove stubborn carbon and gunk 4 unique brush shapes in nylon