The HP OfficeJet R45 uses two ink cartridges: black and tri-color. The compatible black ink replaces the HP 45 (51645A) and prints about 1,100 pages. The compatible tri-color ink replaces the HP 23 (C1823D) and prints about 690 pages. The same supplies also fit the OfficeJet R40, OfficeJet R60, and OfficeJet R65. Same-day shipping on most orders.
