The HP PSC 750xi uses two ink cartridges: a black and a tri-color. The compatible black ink replaces the HP 15 (C6615DN) and prints about 840 pages. The compatible tri-color ink replaces the HP 78 (C6578AN) and prints about 710 pages. The same supplies also fit the HP PSC 750, PSC 950, and DeskJet 940C. Same-day shipping on most orders.
