This genuine HP 21 ink cartridge is the perfect addition for your printer. The black ink is sure to provide the sharp and clear text that you need. It is compatible with HP printers and is guaranteed to fit the HP 21 model, meaning you do not have to worry about any compatibility issues. This product is brand new and sealed, it is also guaranteed to last for a long time. Add this to your cart today and enjoy the high quality prints that this ink has to offer.