4 pack replacement guide arms for Comtac headsets and earmuffs - Fits the following Comtac Headsets: - ComTac II / III / IV / V / VI / VII - FB series - MT Series - TAC100 / 300 / 500 headsets - Most clones - Connects to headband, neckband, ARC rail headset adapter, or hard hat attachment models - Direct replacement for Comtac part # A43-F/4