TonerPals Remanufactured Ink Cartridge Replacement for HP 78 (2 Color) Backed by a 100% Guarantee and a One-Year Warranty ISO 9002 Quality Certified Manufacturing Process Page Yield: Up to 450 pages each Color These cartridges were professionally refurbished 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.