This kit contains an Upper Receiver Brush, Bolt Carrier Brush, Chamber Brush and .308 Bore Brush. They are sized to close tolerance for precision cleaning. They are made out of a distinctive blue fiber, which is thick, stiff and holds it's shape well. This allows for back and forth action unlike traditional brass and bronze type brushes. They may be used several times before becoming worn. You may also purchase these brushes separately. Select the drop down box for the choices. Please note: Warning: This contains a chemical known to the State of California to cause birth defects, reproductive, or other physical harm. Wear gloves or wash hands after handling. For further information go to www.p65warnings.ca.gov.