This listing is for two genuine HP 45 black ink cartridges, model number 51645A. These cartridges are brand new and have never been opened, with an expiration date of May 2001. They are compatible with HP Officejet Pro 8600 printers and have a print technology of inkjet. The unit quantity is one and the unit type is a sealed OEM package. These cartridges are manufactured in Ireland and are suitable for use in HP printers.