Brother TN-3380 Black Toner Cartridges are specially formulated to ensure quality, high resolution results. With Brother laser machines the toner and drum units work independently so when one unit runs out, you don't have to replace both, resulting in reduced waste and significant cost savings. With a high page yield of approximately 8000 pages per cartridge (more than double the standard cartridge capacity) at 5% coverage, Brother's toner cartridges provide excellent value for money.