I bought this pack of 3 sets of cartridges for my Canon MP540 equipped. These cartridges are identified as compatible with this type of printer. When inserting the first set of cartridges, none has been recognized by the printer and the printer refused to start printing (not recognizing the cartridges). I unpacked the second set of cartridges that worked him in part (recognized by the printer when inserted in cart) except the small black cartridge. It was necessary that I use the little black cartridge of the third set to operate the set. An article containing 3 Set of 5 cartridges, I would only be able to perform a complete replacement cartridges ... After verification of chips, some showed signs of corrosion when I had to get them out of their packaging.