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HP OfficeJet Pro 6978 Ink Cartridges - T6L98AN Cartridges provides high quality compatible & OEM printer cartridges & supplies for the HP OfficeJet Pro 6978. Our compatible T6L98AN ink 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.