Lexmark T640, T642 & T644 supplies are designed for the highest quality output, performance & easy installation, from the first page to the last. Lexmark T640, T642 & T644 supplies are not compatible with other Lexmark Printers. For use with Lexmark T640, T640n, T640dn, T640dtn, T642, T642n, T642tn, T642dtn & T644, T644n, T644tn, T644dtn printers.