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HP CopyJet m Inkjet Cartridges - 51640A Cartridge provides high quality compatible & OEM printer cartridges & supplies for the HP CopyJet m. Our compatible 51640A inkjet cartridges are guaranteed to meet or exceed the factory cartridge specifications, and are backed by our Lifetime Cartridge Warranty. We also carry a full line of OEM cartridges backed the the original manufacturers one year warranty.