Color: 56F1U00 Black. OEM Number: 56F1U00. Printer Model Compatibility: Lexmark MS621dn, Lexmark MX321adw, Lexmark MS521dn, Lexmark MX421ade, Lexmark MX622ade, Lexmark MX521de. Page Yield: 25000. High Yield: 25000 pages per for Lexmark MS321 MS421 in black.
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