Return Program toner cartridge is designed for use with Lexmark C734, C736, X734, X736 and X738 laser printer series. Superior Lexmark design means precision pairing between printer and cartridge for value, quality and environmental responsibility you can count on. Enjoy outstanding results page after page, year after year. 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 6,000 pages.