Toner Refill Store's premium compatible Xerox black toner cartridges contain brand new parts and are 100% guaranteed to meet or exceed your expectations and surpass the print quality of the OEM (Original Equipment Manufacturer) Xerox DocuPrint N4525/BN. Our Xerox DocuPrint N4525/BN monochrome toner cartridges are made from the highest quality materials and are manufactured in an ISO-9001 certified factory. Go green with our toner refill kits which allow you to refill your cartridge and reuse it! Toner Refill Store supplies each cartridge with a brand new smart chip which will get rid of your 'low toner' message. The use of our premium compatible laser toner cartridges for the Xerox DocuPrint N4525/BN does not void your printer's warranty. Our Xerox DocuPrint N4525/BN high yield laser toner cartridges have a 'One Year 100% Satisfaction Guarantee'.