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.Lexmark Return Program CartridgesLexmark 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 or recycling. These patented cartridges are licensed for single use only and will stop working after delivering a fixed amount of ink and/or toner. Ink and/or toner may remain in the cartridge when replacement is required. Replacement cartridges sold without these restrictions are also available.Lexmark Cartridge Collection ProgramGoing 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.Standard YieldKeep up-front costs low and quality high with Genuine Lexmark cartridges. Standard Yield cartridges offer a lower purchase price and contain fewer pages than High Yield cartridges do. Perfect for low volume printing.Lexmark RewardsSave up to 20% on supplies and go green with Lexmark Rewards. You'll earn free High Yield toner cartridges and imaging kits simply for using Genuine Lexmark toner and returning your empty cartridges to Lexmark for recycling.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 CX 431 dw. Lexmark CX 430 Series. Lexmark CX 431 adw. Lexmark CS 431 dw. Lexmark CS 331 dw. Lexmark CX 331 adwe