INK4WORK Remanufactured Toner Cartridge Replacement for HP 131A  ( Cyan, Yellow, Magenta , 3 pk ) Approximate cartridge yield: Black up to 1,600 standard pages, Color up to 1,800 Standard pages (5% coverage of lettle size paper)(average continuous black, declared yield value in accordance with ISO/IEC 19798, actual yields vary considerably based on images printed, other factors. ISO9001 certified. Sold by ink4work Not made by HP