These cartridges are definitely the best for my HP Pro 8600. And fortunately also saw their exorbitant price (80 euros the full game, it does not make me laugh, or when YELLOW !!) BLACK single point but size. I tested the product cartridges WHITE "compatible". A disaster: approximate colors, lines, and many stains. I saw RED and I therefore resolved to murder my portfolio to maintain print quality. The same but cheaper cartridges allow me to see the life of a printer in BLUE.