This product is the first brush specifically designed for cleaning the AR-15 6.5 Grendel chamber. Engineered to precise tolerances, it ensures thorough cleaning. Constructed from a unique blue fiber, the brush is thick, rigid and maintains its shape effectively, unlike traditional brass and bronze brushes. It is durable and can be used multiple times before showing signs of wear. The pack includes two brushes. It is recommended to use this brush with Iosso bore cleaner and Iosso triple action oil. Purchasing all three products together offers cost savings.