Brother Genuine Drum Unit. Delivers crisp, professional color laser output with 50,000-page yield (approximately 50,000 pages based on three pages per job and 30,000 pages based on one page per job of letter/A4 simplex pages). The number of pages may be affected due to a variety of factors including but not limited to media type and media size. Designed as part of a complete printing system to provide superior quality results. Precisely balanced for even flow and consistent toner distribution on the paper. Enjoy ongoing improvements and technical changes, which regularly occur throughout the hardware lifecycle.