The HP DesignJet 450C ink is the black 51640A, also called HP 40. This compatible ink replaces the HP 40 (51640A) and is a standard-capacity cartridge rated at about 1,100 pages. The same ink also works with the DesignJet 430, DesignJet 455C and DesignJet 488CA. Same-day shipping on most orders.
