I installed these cartridges in my HP printer (C4280) and as most reviews on this product say they are not compatible with my printer. According to the HP website, the 74 and 75 cartridges are the ones I need to use for this printer. If you are reading this, do not buy these cartridges! Head to your local Walgreens or CVS and pay a few bucks more to ensure you're getting quality and compatible cartridges to match your printer. I waited too long to return the package and now I wasted $40 and need to buy more ink from another source. Revain If you are reading this review, please read all other 1 and 2 star reviews and remove this product from your site. I have never had a problem with the products sold here - this is the first time.
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