Lexmark Return Program Cartridges are sold at a discount versus 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. Regular cartridges without this license/agreement sold at regular prices are also available. Regular cartridges are also recyclable at no cost through Lexmark Cartridge Collection Program.Compatible Printers: Lexmark X 466 Series, Lexmark X 460 Series, Lexmark X 464, Lexmark X 463, Lexmark X 464 DE, Lexmark X 466 DTE, Lexmark X 463 DE, Lexmark X 466 DE, Lexmark X 466 DWE, Lexmark X 466