These printers use the T-6000 cartridge:
Click On a Printer to View it's Cartridges
          Toshiba e STUDIO 520
          Toshiba e STUDIO 520-52CPM
          Toshiba e STUDIO 600
          Toshiba e STUDIO 600-60CPM
          Toshiba e STUDIO 720
          Toshiba e STUDIO 720-72CPM
          Toshiba e STUDIO 850
          Toshiba e STUDIO 850-85CPM
          Panasonic WORKiO DP-6540
          Panasonic WORKiO DP-7240
          Panasonic WORKiO DP-8540