- The HP 21 black inkjet print cartridge prints professional looking documents with laser quality black text. HP pigment based black ink provides crisp sharp text for your letters and reports.
- Print greeting cards, homework, letters, e-mail, information from the Internet, and reports. HP 21 black inkjet print cartridges are simple to install and easy to use. Alerts notify you when ink is running low so you can purchase a replacement cartridge
- The HP21 black ink cartridge is suitable for use with the following HP Printers
- HP DeskJet 3920 and 3940.
- HP al-in-one PSC 1402, 1410, 1415 and 1417.
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