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This is the THICKER cartridge, not the THINNER one, fyi. I just called HP and clarified a few things, if anyone is interested. I have a HP Photosmart 7525. I ordered this original ink cartridge-which fits the thicker cartridge. When I called HP they told me that if you want the thinner black cartridge it is referred to as: Photo Ink. The model number for the photo ink is: CB317WN#140-if you wanted to type it into amazon or the hp ink website. I told them they really need to clear this up for customers so that we are all not stuck with the wrong sized cartridge. I know I can use it eventually, but I needed the thinner one(photo ink) and I ordered this original ink cartridge. I'm hoping this information will help others!