The HP OfficeJet R40xi uses two standard-capacity inks: HP 45 (51645A) black, rated at about 1,100 pages, and HP 23 (C1823D) tri-color, rated at about 690 pages. Both are compatible inks. The same supplies also fit the OfficeJet R40, OfficeJet R45, and OfficeJet R60. Same-day shipping on most orders.
