Premium 56F1H00 High Yield Black Toner Cartridge fully compatible with the Lexmark MS321dn, MS421dn, MS421dw, MS521dn, MS621dn, MS622de, MX321adn, MX321adw, MX421ade, MX521de, MX521ade, MX522adhe, MX622ade, MX622adhe. The use of compatible supplies does not void your printer warranty.