Lexmark Return Programme CartridgesLexmark Return Programme cartridges are print cartridges sold at a discount in exchange for the customer's agreement that the cartridges will be used only once and returned only to Lexmark for remanufacturing or recycling. These single-use only cartridges will stop working after reaching the end of the rated life established by Lexmark (a variable amount of toner may remain when replacement is required). Lexmark Cartridge Collection ProgrammeGoing green has never been easier. Recycle all your used Lexmark supplies by letting us take care of the details. It’s simple. smart and always free.Best TogetherGenuine Lexmark supplies are engineered to work Best Together with your Lexmark printer. delivering excellent print quality from the first page to the last.Unison™ TonerEssential to Lexmark print system performance. Unison™ Toner's unique formulation consistently delivers outstanding image quality. ensures long-life print system reliability and promotes superior sustainability -- all in an innovative shake-free print system.Compatible Printers: Lexmark CS 737 dze. Lexmark CS 730 de. Lexmark CX 735 adse. Lexmark CX 730 de. Lexmark CS 735 de. Lexmark CX 737 adzse