I installed this correct pair of ink cartridges into my HP printer, but my printer kept telling me that the colour cartridge was not compatible. and to buy a genuine HP ink cartridge. I tried everything, and gave up. I bought a £40 Cannon PIXMA MG425 3 in 1 printer which included a pair of standard size ink cartridges, as I did not know if it was the cartridge at fault, or the printer. And I was not going to waste time and money trying to find out. I dumped the HP cartridges, and my HP printer.