High-yield toner cartridge is designed for use in Lexmark C540, C540DW, C540n, C543, C543dn, C544, x543, x544, x546 and x548 series. 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.