Compatible with Oki Microline 120 | Works in 172, 180, 182, 184T, 320 | Also for use in Oki Data 120 and more | Quality construction | Easy to install | 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