INKUTEN &copy; Compatible Hewlett Packard HP 15 Black (C6615DN / C6615D) & HP 78 Tri Color (C6578DN / C6578D) Combo Pack of 4 Ink Cartridges Cartridges are manufactured in an internationally certified ISO 9002 factory and come with a 100% 365 day money back guarantee and technical support. 100% satisfaction or your money back INKUTEN is the exclusive seller of toner refill kits, Inkjet Cartridges, Toner Cartridges, and Drum Units INKUTEN offers free technical support for any questions you may have 600 Each Black & 450 Color Page Yield