Genuine/Original Brother LC51BK ink cartridge. This black ink cartridge is designed for use with Brother printers and is compatible with the Brother brand. The cartridge comes in a box that contains two cartridges. The Brother LC51BK ink cartridge is perfect for anyone who wants high-quality printing without having to worry about the condition of the cartridge. The black ink color ensures that your documents come out sharp and clear. This pack of two cartridges is ideal for those who have a lot of printing to do.