HP 27/28 CIS ink system for Deskjet 3320 3420 3425 3520 3550 3620v 3650 3651 3740 3745 3747 3843 3845 3847, Fax 1240 Inks made in USA Fits HP printers with 27/28 cartridges 12-15 times more ink volume than OEM cartridges Easiest refill w/ our pour spout refill bottles 1 year warranty