This LD remanufactured 51604A black inkjet cartridge is an original Hewlett Packard 51604A ink cartridge which has been through one cycle of service and has been recharged. This LD remanufactured 51604A ink cartridge has been thoroughly cleaned along with the printhead nozzles. Following the cleaning process, we refilled the cartridge with a professionally manufactured ink formula that is designed to produce vibrant and long-lasting prints comparable to HP. After carefully inspecting the shell for leakage and monitoring the electrical circuitry for efficiency, we put the cartridge through a final print test to be certain it is worthy of our 100% money-back guarantee. Our remanufactured ink cartridges are not remanufactured by HP. We offer a Two-Year 100% Quality Satisfaction Guarantee on our remanufactured 51604A ink cartridges. For use in the following printers ThinkJet QuietJet.