These printers use the 51640M cartridge:
Click On a Printer to View it's Cartridges
          HP Color Copier 210
          HP Color Copier 210 LX
          HP CopyJet
          HP CopyJet M
          HP DesignJet 230
          HP DesignJet 330
          HP DesignJet 430
          HP DesignJet 650
          HP DeskJet 1200 C
          HP DeskJet 1200 C-PS
          HP DeskJet 1600 C
          HP DeskJet 1600 CM
          HP DeskJet 1600 CN
          Riso-Corporation RJ 1100