Speedy Inks Toner Cartridge Replacement for Okidata 43502301 Type 9 (Black, 4-Pack) For use in: B4400, B4400N, B4500, B4500N, B4550, B4550N, B4600, B4600N, B4600N PS Page Yield: 3000 | Color: Black Shelf Life: 24-36 Months The use of aftermarket replacement cartridges and supplies does not void your printer's warranty