These printers use the MX-C40NTB cartridge:
Click On a Printer to View it's Cartridges
          Sharp MX B-400 P
          Sharp MX C-310
          Sharp MX C-311
          Sharp MX C-312
          Sharp MX C-380
          Sharp MX C-381
          Sharp MX C-400 P
          Sharp MX C-401
          Sharp MX C-402 SC