Return Program toner cartridge is essential to Lexmark Print System performance. Unison toner consistently delivers outstanding image quality, ensures long-life system reliability and promotes superior sustainability - all in an innovative, shake-free print system. Cartridge is compatible with Lexmark CS421dn, CS521dn, CS622de, CX421adn, CX622ade, CX622de, CX625ade and CX625adhe. Genuine Lexmark supplies are engineered to work best together with your Lexmark printer, delivering excellent print quality from the first page to the last. Return Program cartridge is a patented device that is sold at a special price subject to the restriction that the cartridge may be used only once. Following the initial use, return the cartridge only to Lexmark for remanufacture and/or recycling. Keep upfront costs low and quality high with Genuine Lexmark cartridges.