The hp inkjet 51629a is a 600dpi black pigmented ink which has a refillable cartridge and an ink volume of 5ml. It was manufactured to replace the Hewlett Packard 51626A inkjet cartridge.
Refrences:
http://www.databazaar.com/Inkjet_Cartridge/Product/Ink_Cartridges_HEW51629A.html