Ink Refill Kit for HP Photosmart C309a Printers using HP 564 Cartridges Highly Reliable Clog Free Formula - Archival ink is filtered to 0.2 um, which is the same as original ink Smudge-Proof, Fast Drying, Fade Resistant Prints - The advanced archival ink formula prevents ink foam from appearing in the ink chamber Precisely Calibrated Ultra Wide Color Gamut Equivalent to 50 Cartridges - Save $750 Compared to Buying New Cartridges Simple and Convenient Refilling Process