4 Pack 981X Black Remanufactured Ink Cartridge Replacement for HP PageWide Enterprise Color 556dn,556 Printer Series,Flow MFP 586dn,Flow MFP 586f,Flow MFP 586 Series Printers.4 Pack 981X Black Remanufactured Ink Cartridge Replacement for HP PageWide Enterprise Color 556dn,556 Printer Series,Flow MFP 586dn,Flow MFP 586f,Flow MFP 586 Series Printers.