Ink4work 2 Pack Remanufactured Okidata 44574901 High Yield Compatible Toner Cartridge Fits Okidata B431D B431DN MB461 MB471 Approximate cartridge yield: up to 10,000 standard pages (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 only by ink4work Not made by okidata