The genuine black image drum works with your Oki printer to deliver crisp, clean image quality. In order to print high resolution text and images at laser-like speeds your printer uses an image drum. This replacement drum unit is built from robust Oki parts that work in harmony with your printer to deliver professional print quality. The black image drum works exclusively with black text and images so that you can print with increased speed and accuracy. It becomes necessary to replace your old image drum when it has been exhausted or performs poorly. This economical black imaging drum will instantly refresh your printer's imaging system and allow you to print consistently for approximately 20,000 pages.