Sophia Global Remanufactured Ink Cartridge Replacement for HP 56 and HP 57 (1 Black, 1 Color) Backed by a 100% Guarantee and a Two-Year Warranty ISO 9002 Quality Certified Manufacturing Process Up to 520 pages each black and up to 500 pages each color These cartridges were professionally remanufactured in an ISO 9002 factory. Each cartridge was used once and then sent to our factory where it underwent an extensive process including cleaning, testing the chip, and ink refilling. Before being sealed, each cartridge is tested in a live printer to ensure crisp text and true color reproduction. The cartridges are finally sealed and placed in a static protective bag.