This ONYX Imaging Drum is compatible with Oki C900 series, including C911, C931, C941, &, C942, ES9411, ES9431, ES9541, ES9542, Pro9431, Pro9541, Pro9542 with a yield of 50-76K pages. The Yellow imaging drum units and supplies are high quality, reliable drums with exceptional yields. Print excellent, crisp pages ideal for both home and office use with the Oki C900 Series drum units. Manufacturer Part Number : 45103725