Lexmark #56F0UA0 - Ultra HY Black Toner genuine
MS521, MS621, MS622, MX521, MX522, MX622 series laser printers - Black Toner Cartridge, Ultra High Yield (approx. 25,000 page yield)
Lexmark #56F1000 - Standard Black Toner genuine
MS321, MS421, MS521, MS621, MS622, MX321, MX421, MX521, MX522, MX622 series laser printers - Black Toner Cartridge, Standard Yield (6,000 page yield) (return program shipping label included)
Lexmark #56F1H00 - HY Black Toner genuine
MS321, MS421, MS521, MS621, MS622, MX321, MX421, MX521, MX522, MX622 series laser printers - Black Toner Cartridge, High Yield (15,000 page yield) (return program shipping label included).
Lexmark #56F1U00 - Ultra HY Black Toner genuine
MS521, MS621, MS622, MX521, MX522, MX622 series laser printers - Black Toner Cartridge, Ultra High Yield (approx. 25,000 page yield) (return program shipping label included)
Lexmark #56F1X00 - Extra HY Black Toner genuine
MS421, MS521, MS621, MS622, MX421, MX521, MX522, MX622 series laser printers - Black Toner Cartridge, Extra High Yield (approx. 20,000 page yield) (prepaid return program shipping label included)