Extra high-yield toner cartridge is designed for use in Lexmark C544, C544DN, C544DTN, C544DW, C544N, 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.Extra high-yield toner cartridge is designed for use in Lexmark C544, C544DN, C544DTN, C544DW, C544N, 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.