These printers use the T5018U cartridge:
Click On a Printer to View it's Cartridges
          Toshiba e STUDIO 2018 A
          Toshiba e STUDIO 2518 A
          Toshiba e STUDIO 3018 A
          Toshiba e STUDIO 3518 A
          Toshiba e STUDIO 4518 A
          Toshiba e STUDIO 5018 A