This HP 21 (C9351A) Black Ink Cartridge is a top-quality product that guarantees high-quality and crisp prints every time. With a compatibility for Hewlett Packard and HP printers, it offers versatility in printing for any office or personal use.

The ink cartridge uses a standard type of printing technology including inkjet, pigment and thermal printing, allowing users to use it for a variety of printing purposes. The black ink cartridge is perfect for printing text, graphics, and other documents. The model is specifically designed for HP Officejet Pro 8600 and is compatible with other HP models as well.