Our inkjet cartridges are guaranteed to perform as well as your original Brother inkjet cartridge they are replacing. This compatible cartridge is manufactured in a way that it holds 1.5x the ink compared to OEM (50% extra ink) When you buy this inkjet cartridge you are buying a high quality cartridge from a reputable source at substantial savings compared to buying brother inkjet cartridges from office supply stores. LC41BK (LC 41 black) compatible inkjet cartridge LC41BK (LC 41 black)