Okidata Black Nylon Ribbon for Microline 320/321 Printers -5/6-Inch x 2 Yards For use with Oki Micro line and Okimate printers. Long life and exceptional character definition. Black Replacement ribbon for Okidata 320/321 dot-matrix printers Also compatible with Microline 100 series Prints through multi-layer forms Rated for 3 million characters Color : Black ink