Laser Tek Services&reg; Okidata B4600 / B4400 (43502001) High Yield Remanufactured Replacement Drum Unit for the Okidata B4400, B4400n, B4500, B4500n, B4550, B4550n, B4600, B4600n, B4600n PS Package comes with 1 drum unit. Page Yield: 25,000 @ 5% page coverage. The product is guaranteed to meet or exceed your expectations, offering premium print quality at low prices! The compatible toner cartridge will produce the same amount of page yield as an OEM cartridge would. We offer excellent customer service; including email and phone support.