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This is compatible chip for Xerox Phaser 6121 MFP and other printers. Required for a successful refill and for the printer to recognize the cartridge. Easy to install. Replaces the OEM chip.
Item #: 185-321-01Black (Black)185-321-01Cyan (Cyan)185-321-01Magenta (Magenta)185-321-01Yellow (Yellow)