221
Colour: Black. Page Yield: 6,000. Compatible with: MS321dn, MS421dn, MS421dw, MS521dn, MS621dn, MS622de, MX321adn, MX321adw, MX421ade, MX521ade. MX521de, MX522adhe, MX622ade, MX622adhe. Original Lexmark 6K monochrome laser toner cartridge.