Review on 15-Pack RETCH Compatible Ink Cartridge Replacement for HP 564XL 564 XL, for DeskJet 3520 3522, Officejet 4620, Photosmart 5520 6510 6515 6520 - Includes 3 Black, 3 Photo Black, 3 Cyan, 3 Magenta, and 3 Yellow Cartridges by Calvin Hodges

Product packaging made a very strong impression. As mentioned in one of the other reviews, one of the black ink cartridges was the wrong size and didn't fit the HP printer. I had the same problem. After reading this I inspected another black ink cartridge and found that the size was different than the one I opened and would fit the printer. Quality control could be better as I cannot use this fake black ink cartridge. There may be others in the package. I'll probably try a different brand if I run out of these cartridges and depending on the number of mismatched cartridges I encounter.