This is compatible toner cartridge for Brother OEM part #TN850. The page yield of this Brother toner cartridge is 8,000 pages based on 5% page coverage. This toner cartridge is made of high quality standards and is guaranteed to meet or exceed OEM specifications. Toner Booth provides 100% guarantee all of its compatible cartridges and re-manufactured cartridges. You will also receive free shipping on all US order over $50.