The HP OfficeJet J4640 Ink Cartridges will eject bright colors and rich black tones, ideal for the small business or office environment. Each Genuine and Remanufactured HP 901 and HP 901XL Ink Cartridge for your HP OfficeJet J4640 Printer has a long-lasting 1-2 year shelf-life, providing definitive convenience and performance. The Genuine and Remanufactured HP Ink Cartridges have a space saving design which easily installs, to reduce downtime normally spent on complicated replacement procedures. The HP Officejet J4640 utilizes thermal ink technology to quickly dry for less smudging and blurring on printouts when handled. And all of our HP Ink Cartridges are backed by a 90 day money back guarantee.