The Pitney Bowes 1640 Fax Toner Cartridges will eject deep and rich black tones, ideal for the small business or office environment. Each Remanufactured Pitney Bowes 817-5 Fax Toner Cartridge and Remanufactured Pitney Bowes 817-6 Drum Unit Cartridge for your Pitney Bowes 1640 Printer has up to a 2 year shelf-life, providing definitive convenience and performance. The Remanufactured Pitney-Bowes fax toner and drum cartridges for your Pitney Bowes 1640 were designed with reliable and dependable specifications to withstand the toughest printing tasks. The Remanufactured Pitney Bowes Toner Cartridges go through a vigorous inspection process before refilling, to ensure outstanding printing results. And all of our Pitney Bowes Toner Cartridges and Drum Units are backed by a 90 day money back guarantee.