The use of Brother Genuine replacement ink cartridges like the LC3719XLBK not only produces sharp, high-quality printouts with no streaking or smudging - it also lets you save money, time and paper due to less downtime or repairs. The Brother LC3719XLBK black ink cartridge replacement is for use with Brother inkjet printers. This printer cartridge is intelligently engineered to work in seamless unison without compromising the quality of the print. This replacement cartridge is for use with the following Brother inkjet printers and all-in-ones: MFC-J2330DW, MFC-J3530DW, MFC-J3930DW.