This is a two-cartridge pack of Original HP 123 ink in retail blister packaging, containing one HP 123 Black and one HP 123 Tri-colour cartridge, so you can replace both inks in one purchase. HP 123 cartridges are made for HP's compact home and small-office inkjets such as the HP DeskJet 2130 and DeskJet 2622. The black cartridge uses pigment-based ink for crisp, smudge-resistant text and is rated by HP at about 120 pages; the tri-colour cartridge holds cyan, magenta and yellow dye-based ink for colour documents and photos and is rated at about 100 pages (standard yields, based on HP testing; actual yield varies with what you print). Original HP cartridges are designed together with the printer for consistent results and are covered by HP's supplies warranty against defects in materials and workmanship. Buying the pair together is convenient for households, students and small offices that print a mix of homework, letters and occasional colour pages. Check that your printer takes HP 123 cartridges (not 123XL-only or a different series) before ordering.