MTI 43501901 Compatible Image Drum For Okidata B4400, B4500, B4550, B4600 Yield: 25,000 standard pages Compatible Printers: Okidata B4400, B4500, B4550, B4600 Series Replaces OEM Part #: Oki 43501901 If you do not receive your product in an MTI-branded box, it is not a genuine MTI product. Let Amazon know.