The HP 21 Black Ink Cartridge is a new, authentic product sealed by HP. With an expiration date of march / 2010, this standard ink cartridge is designed for use with Hewlett Packard and HP printers. Specifically compatible with the HP Officejet Pro 8600, this cartridge utilizes inkjet, pigment, and thermal print technology to ensure high-quality black prints. Made in Malaysia, this product is reliable and efficient for all your printing needs.