These printers use the RC300BK cartridge:
Click On a Printer to View it's Cartridges
          Star-Micronics MP 300
          Star-Micronics MP 312 F
          Star-Micronics MP 317
          Star-Micronics MP 321 S-24
          Star-Micronics MP 322 S-24
          Star-Micronics MP 323 S-24
          Star-Micronics MP 342
          Star-Micronics MP 347
          Star-Micronics MP 352 S
          Star-Micronics MP 382
          Star-Micronics SP 300
          Star-Micronics SP 310
          Star-Micronics SP 311
          Star-Micronics SP 312
          Star-Micronics SP 316
          Star-Micronics SP 317
          Star-Micronics SP 320
          Star-Micronics SP 321 SProCKET
          Star-Micronics SP 322 SProCKET
          Star-Micronics SP 323
          Star-Micronics SP 341
          Star-Micronics SP 342
          Star-Micronics SP 347
          Star-Micronics SP 348
          Star-Micronics SP 349
          Star-Micronics SP 389
          Star-Micronics UP 389
          Citizen MP 300
          Citizen SP 300
          Samsung ER 350
          Samsung ER 550
          Samsung ERP 200
          Samsung SMP 200
          Samsung SRP 100
          Samsung SRP 200
          Samsung SRP 250
          Star SP 300
          Star SP 310
          Star SP 320