Extra high-yield toner cartridge is designed for use with Lexmark T644, T644dtn, T644n and T644tn. Superior Lexmark design means precision pairing between printer and cartridge for value, quality and environmental responsibility you can count on. Choose Genuine Lexmark supplies for genuine Lexmark results. Lexmark Return Program Cartridges are sold at a discount, vs. the prices of regular cartridges, in exchange for the customer's agreement to use the cartridge only once and return it only to Lexmark for remanufacturing or recycling. Cartridge yields approximately 32,000 pages.