Essential to Lexmark print system performance, Unison Toner's unique formulation consistently delivers outstanding image quality and ensures long-life print system reliability—all in an innovative shake-free print system. High Yield: Maximize your savings and enjoy premium quality with Genuine Lexmark cartridges. High Yield cartridges offer a lower cost per page and contain more pages than Standard Yield cartridges do. Perfect for high volume printing. Best Together: Genuine Lexmark supplies are engineered to work Best Together with your Lexmark printer, delivering excellent print quality from the first page to the last. Lexmark Cartridge Collection Program: Recycle all your used Lexmark supplies by letting us take care of the details. It's simple, smart and always free. Lexmark Return Program Cartridges: Lexmark Return Program cartridges are patented print cartridges sold at a discount in exchange for the customer's agreement to the license requirement that the cartridges will be used only once and returned only to Lexmark for remanufacturing and\/or recycling. The Return Program cartridges are licensed for single use only and are designed to stop working after the delivery of a fixed amount of toner. A variable amount of toner will remain in the cartridge when replacement is required. In addition, the cartridge is designed to automatically update the memory in your printer to protect against the introduction of counterfeit and\/or unauthorized third-party cartridges.