Genuine BT mono (black) ink-jet printhead for use in the Paperjet 50/60, Paperjet 55/65, the BF-550, BF-550E and the DF-450 machines This cartridge will NOT WORK in the new BT PaperJet 50E, 55E, 60E and 65E Machines Box contains one cartridge Please note, the old printhead & refill packs are no longer available Code M2176