Lexmark 56F000G Black Toner Cartridge is designed to perform in the Lexmark MS321, MS321dn, MS421, MS421dn, MS521dn, MS621dn, MS622de, MX421ade, MX521de, MX622ade.
Lexmark 56F0H0G High Yield Black Toner Cartridge is designed to perform in the Lexmark MS321dn, MS421dn, MS421dw, MS521dn, MS621dn, MS622de, MX421ade, MX521ade, MX521de, MX622ade.
Lexmark 56F0U0G Ultra High Yield Black Toner Cartridge is designed to perform in the Lexmark MS521dn, MS621dn, MS622de, MX521ade, MX521de, MX522adhe, MX622ade, MX622adhe.