Oki 4823 Fabric Ribbon Black 2496 for use with 590/591. Install a genuine OKI ink ribbon in your ML590 or 591 Microline dot matrix printer for top quality results. This ribbon is designed for an easy changeover to ensure quick installation. The high quality nylon construction gives minimal wear, offering a lifespan of up to 4 million characters per ribbon. It uses premium-quality inks with a metered output for consistent quality, precisely controlled to ensure even coverage for each and every character.