Lexmark - Black - Original - Toner Cartridge LRP MS321, MS331, MS421, MS431, MS521, MS621, MX331, MX421, MX431, MX521

PRODUCT DESCRIPTION Consistently outstanding image quality. Long-life system reliability. Superior sustainability. Innovative shake-free print system. Unison Toner Essential 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. Lexmark Return Program Cartridges Lexmark Return Program 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 end of the rated life established by Lexmark (a variable amount of toner may remain when replacement is required). These cartridges may also automatically update the printer memory to protect the printer from counterfeit and unauthorized products. Supplies without this single-use term are available at www.lexmark.com. Lexmark Cartridge Collection Program Going 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 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. Standard Yield Keep 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. Manufacturer: Lexmark International, Inc. Manufacturer Part Number: 55B1000. Brand Name: Lexmark. Product Line: Unison. Product Name: 55B1000 Return Program Toner Cartridge. Product Condition: Original. Packaged Quantity: 1 Pack. P