The premium bore brushes feature a distinctive cobalt blue fiber, ensuring they stand out from other types of brushes. Designed with a thicker and stiffer grade of fiber, these brushes support effective back-and-forth cleaning action, unlike traditional brass and bronze brushes. Remarkably durable, they last approximately 8 - 10 times longer than standard brushes. The brush construction is notably tight, with more fiber per inch than any other brush available. For optimal results, use these brushes with the IOSSO Bore cleaner and triple action solution to efficiently remove all types of fouling, including copper, lead, plastic wad, and carbon burn. This combination significantly reduces cleaning time, delivering an exceptionally clean bore. The blue brushes are a registered trademark of IOSSO products.