The HP OfficeJet R80xi uses two ink cartridges: a black HP 45 (51645A) and a tri-color HP 23 (C1823D). Both are standard-capacity compatible ink. The black is rated for about 1,100 pages and the tri-color for about 690 pages. The same supplies also fit the OfficeJet R80, OfficeJet R65, and OfficeJet R60. Same-day shipping on most orders.
