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, 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.