From the Manufacturer
AR-15 Platform TFR (Total Fouling Removal) Kit for the AR-15 Rifle (.223 Cal.) is made with black heavy duty long lasting nylon bristles. These brushes were made specifically for your AR-15 and built tough so they can be used repeatedly. Fits Standard American Cleaning Rod with #8-32 Threads.
Kit Contains the Following Brushes: Upper Receiver Brush, Bolt Carrier Brush, Bore Brush, and Chamber Brush.