This Epson ERC-31 B black ribbon cartridge is designed for use with dot matrix printers. It is a genuine and original product that guarantees high-quality prints. The ribbon cartridge is compatible with the M-930 model and is perfect for those who require dependable and high-performance printing solutions. The cartridge is easy to install and ensures that your printer produces crisp, clear, and professional-looking prints every time. Get this black ribbon cartridge today and enjoy the benefits of reliable printing solutions.