This is a twin pack of Original HP 305 Black ink cartridges in retail blister packaging, providing two black cartridges in one purchase for users who print mostly text. HP 305 cartridges are made for HP's current compact inkjets, including the HP DeskJet 2300, 2700 and 4100 series (such as the DeskJet 2710, 2720 and 4120) and the HP ENVY 6000 and 6400 series. The black ink is pigment-based for crisp, dark text. HP rates each HP 305 Black cartridge at approximately 120 pages at standard yield (17.9 ml of ink; actual yield depends on content and usage), so the pack covers roughly 240 pages in total. Original HP ink is designed alongside the printer for consistent, reliable results and is covered by HP's supplies warranty against defects. The HP 305 range suits households, micro-businesses and students printing everyday documents and homework, and a spare black cartridge avoids running out mid-print. If you print a lot, HP also offers the higher-yield 305XL black cartridge. Colour ink is not included in this pack; check your printer takes HP 305 before ordering.