Continuous Ink System CIS for Canon PIXMA iP4700 Printers using CLI-521 PGI-520 Cartridges Each delivery cartridge contains an everlasting ARC that overrides the ink level control software to enable the ink levels to be reset back The advanced archival ink formula prevents ink foam from appearing in the ink chamber and brings over 80 years of fade resistance to your prints. The archival ink produces a bright, vibrant print with strong life-like color intensity that is truly professional quality photo lab print. Equivalent to 50 Cartridges - Save $750 Compared to Buying New Cartridges Refill your empty original cartridges and continuous ink systems within 5 minutes with this complete kit.