Return Program toner cartridge is designed for use with Lexmark C736DN, C736DTN, C736N, X736DE, X738DE and X738DTE. 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. Cartridge yields approximately 12,000 pages.