Manufacturer Part Number 56F0U0G. Genuine Lexmark OEM toner. Compatibility: Lexmark Printers: MX521ade MX521de. Yield Type:Ultra High-Yield For Use With:Lexmark MS521, MS621, MX521, MX522, MX622. For Use With:Lexmark MS521, MS621, MX521, MX522, MX622 Product Biodegradability Indicator:N.
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