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The IOSSO AR-15 Bolt Carrier Brush 2 Pack (19123) comes with two brushes that are sized to close tolerance for precision cleaning of the AR .223/5.56MM bolt carrier. The brushes are made with a fiber that is cobalt blue which is a stiffer grade of fiber that allows for back and forth action unlike traditional brass and bronze type brushes. The fiber last approximately 8 to 10 times longer than other brushes. The brush is wound tighter and has more fiber per inch than any other brush.