I cannot find this anywhere. I have the 310A and if the black large one is about 1 inch, I want it. No one has it, not even hp.

HP 564XL Black 3X & Color High Yield Compatible Ink Cartridge 5-Pack
You are right. This is 3X yield black ink that HP has discontinued a few years back. Later HP printer are made only to take 2X yield. If you have C310A, you can use this 3X yield. It will last longer.
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Answered by TP on Jul 5, 2016