2.5" O.D. High Sensitivity Topcoated Direct Thermal (Light Visible), Black Sensemark on Liner, permanent adhesive, perfed each, wound out, .75" core. Size: 4" x 4", 1 up, 160 labels per roll, 36 rolls per case. For Zebra Printers: QL, QL Plus Series. For Datamax Printers: RL4, RL3.