Sophia Global Remanufactured Ink Cartridge Replacement for HP 61XL with Ink Level Display (10 Black) Page Yield: Up to 480 Pages per Black ISO 9001 Quality Certified Manufacturing Process These cartridges were used once and then sent to our factory where they underwent an extensive process including cleaning, testing the chips, and ink refilling. Before being sealed, the cartridges were tested in a live printer to ensure crisp text and true color reproduction. The cartridges were finally sealed and placed in a static protective bag. The chips on these cartridges were reset at the factory to display the ink level throughout the printing life of the cartridges.