High-yield toner cartridge contains Unison Toner that is essential to Lexmark print system performance. This 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. Perfect for high-volume printing, high-yield cartridge yields more pages than standard yield cartridges for cost-efficiency in your Lexmark MS711dn and MS710dn. 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 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.Lexmark 521HL Toner Cartridge, 1 Each (Quantity)