Sophia Global Remanufactured Ink Cartridge Replacement for HP 934XL and 935XL (2 Black, 2 Cyan, 2 Magenta, 2 Yellow) Backed by a 100% Guarantee and a Two-Year Warranty ISO 9001 Quality Certified Manufacturing Process Up to 1000 pages per black and up to 825 pages per color These cartridges were professionally remanufactured in an ISO 9001 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.