Since the RL1219TW is a Weatherproof Thermal Transfer label, you'll want to make sure you are using a thermal transfer printer with a ribbon installed. The printer will need to be set for Gap sensing at 0.125" and hold a roll with a 1" core and 4" outer diameter. There are a variety of Zebra brand models that can be used with this product. If you'd like to verify compatibility, please feel free to reach out to Customer Support at 888-575-2235.