Average Cartridge Yield 21,000 standard pages. Declared yield value in accordance with ISO/IEC 19752. Lexmark T640, T642 and T644 supplies are designed for the highest quality output and are designed for easy customer installation and quality performance, from the first page to the last. Lexmark T640, T642 and T644 supplies are not compatible with other Lexmark Printers. This print cartridge comes with oiled fuser wipers for customers that do extensive label printing. For use with Lexmark T640, T640n, T640dn, T640dtn, T642, T642n, T642tn, T642dtn and T644, T644n, T644tn, T644dtn printers.Compatible Printers: Lexmark Optra T 644, Lexmark T 642, Lexmark T 640 DTN, Lexmark T 644 N, Lexmark Optra T 644 DTN, Lexmark Optra T 642 TN, Lexmark Optra T 642 DTN, Lexmark T 640 TN, Lexmark Optra T 640 N, Lexmark T 642 TN, Lexmark T 642 DTN, Lexmark Optra T 640 DN, Lexmark Optra T 640 TN, Lexmark Optra T 642 DN, Lexmark T 642 N, Lexmark T 640 DN, Lexmark T 642 DN, Unisys UDS 544-N 11, Lexmark T 640, Lexmark Optra T 640 DTN, Lexmark Optra T 644 TN, Lexmark T 644 DN, Lexmark Optra T 642 N, Lexmark T 644 TN, Lexmark Optra T 644 N, Lexmark T 640 N, Unisys UDS 540-N 11, Lexmark Optra T 640, Lexmark Optra T 642, Lexmark Optra T 644 DN, Lexmark T 644, Lexmark T 644 DTN