Return Program toner cartridge is designed for use with Lexmark E321, E321t, E323, E323n and E323t. 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. Return Program toner cartridge is a patented device that is sold at a special price subject to the restriction that the cartridge may be used only once. Following the initial use, return the cartridge only to Lexmark for remanufacture and/or recycling. Cartridge yields approximately 3,000 pages.