123inkjets carries remanufactured replacement high yield cartridges for HP printers in a low-cost bulk set of 5! The set comes with 3 black (15) C6615DN and 2 color (78) C6578DN high-quality replacement cartridges for HP printers. With our remanufactured replacement bulk set you can maintain a full ink supply for the home, office or classroom with just one click! The 15 & 78 replacement cartridges for HP printers deliver gorgeous, professional-quality results at a fraction of the cost. Our ink cartridges are not remanufactured by HP. All orders ship fast and are backed by our 2 Year Guarantee!