Our discount compatible Canon PIXMA MP640 ink cartridges will print with the same consistency and reliability as your original Canon printer cartridge. To ensure the best printing experience, we engineer our ink cartridges based on the specifications of your original Canon cartridges. We test every one of our ink cartridges for Canon PIXMA MP640 printers for performance and page quality, so you can be confident our products will deliver the same quality prints as an original Canon cartridge for less. Our comprehensive testing and quality assurance process allow us to offer a full 1-Year warranty and 100% customer satisfaction guarantee on all products. As part of our commitment to our customers, we also offer lifetime customer support, thus providing you complete peace of mind.