HP 991XC Black Contract PageWide Cartridge (M0K29XC) is a black ink cartridge for PageWide printing. Its exact reference, M0K29XC, identifies the 991XC Contract version, helping distinguish it from other cartridge references in the same range.
The data sheet gives a rated yield of 22,000 pages, making this high-yield cartridge suited to print workloads where frequent replacement is inconvenient. HP lists it as a supply for the PageWide Managed Color MFP P77960dns, so it serves as a replacement cartridge for that printer model.