Brother TN3170 High Yield Black Laser Toner is specially formulated to ensure quality, high resolution results with additional value. 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 print yield of approximately 7000 pages (double the standard cartridge yield) at 5% coverage, Brother's toner cartridges provide excellent value for money.