The high capacity TN423 cartridges offer a much higher page yield than the TN421 range also available as genuine Brother toners.Filled with the same amount of black toner powder, the remanufactured Brother TN423BK offers the same high 6,500 page yield as the original. The compatible black toner powder within this refilled Brother TN423BK cartridge has been specially designed to fuse at the same temperature, reducing waste and retaining as much print quality as possible. Although this remanufactured Brother TN423BK toner cartridge has many of the same parts as the genuine article, it is necessary for some components to be changed to give the user the best quality results. This high capacity remanufactured Brother TN423BK black toner cartridge comes with a 100% guarantee of your complete satisfaction.