The RL946DW is a 3" x 3" label on a 1" core roll with a 4" outer diameter. The DW material is our Weatherproof Direct Thermal which works with thermal printers that do not require a ribbon. The LabelTac printers use ribbons so you would want to look at our thermal transfer materials like the Weatherproof Thermal Transfer (TW). We have not tested our products with LabelTac printers but you are welcome to reach out to our Customer Support Team at 888-575-2235 to review your printer model's specifications. You can also visit our Sample Request page for a free samples of our Weatherproof Thermal Transfer material to test with your application. https://www.onlinelabels.com/samples