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The Lexmark T644 print cartridges are designed for easy installation and quality performance to keep printers productive under heavier usage demands and to even further diminish per page costs. The T644 Extra High Yield Print Cartridge is not compatible with other Lexmark Printers including the Lexmark T640 or T642. Average Cartridge Yield 32,000 standard pages. Declared yield value in accordance with ISO/IEC 19752.