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 Phaser 3635MFP S. Our Xerox Phaser 3635MFP S 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 Phaser 3635MFP S does not void your printer's warranty. Our Xerox Phaser 3635MFP S high yield laser toner cartridges have a 'One Year 100% Satisfaction Guarantee'.