Genuine Lexmark 12A7400 Black Return Program Laser Toner Cartridge for the Lexmark E321 / E323 / E323n Laser Toner Printers (3,000 Yield) Guarantee excellent performance and the highest quality documents, page after page Return Program Laser Toner Cartridges are sold at a discount versus the prices of regular laser toenr cartridges in exchange for the customer’s agreement to use the laser toner cartridge only once and return it only to Lexmark for remanufacturing or recycling 3,000 pages yield @ approximately 5% coverage