This remanufactured HP 51604A black ink cartridge is an original Hewlett Packard cartridge that has been cleaned, inspected, and refilled using both OEM and non-OEM parts. It is designed to produce vibrant and long-lasting prints. Each cartridge undergoes a thorough inspection and final print test to ensure reliability and quality. Our remanufactured ink cartridges are not remanufactured by HP, and they come with a 100% Quality Satisfaction Guarantee.