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56 and 57 are not always packaged together. You can get a single, double or even triple 56 pack if you search around. I generally use two 56s (black) for each 57 (color) cartridge, so I don't always buy them together. You have to read your manual or the printer box to see what ink your printer takes. Best, Airie
Sorry, there was a problem. Please try again later.Both HP 56 and 57 cartridges are compatible with HP Deskjet 450, 450c, 5550 and 5551, HP Photosmart 7150, 7350 and 7550, and HP psc 2110 and psc 2210 multifunction printers. That is why they are sold as a combo pack. The HP 22 Tricolor and HP 27 Black or HP 56 Black for your printer.
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