Need a replacement ribbon for your Oki printer? Look no further than the Oki Black Ribbon 720/21/90/91. Designed to provide high-quality, reliable printing, this ribbon is compatible with a wide range of Oki printers. With a yield of up to 3 million characters, it offers excellent value for money and ensures your prints come out looking their best every time. Printer Compatibility: OKI MICROLINE 720,OKI MICROLINE 721,OKI MICROLINE 790,OKI MICROLINE 791