This ink-side-out ribbon features an open 1 in. core for compatibility with a variety of thermal transfer printers, including THT model 4042 and Intermec 3440. One-color ribbon for printing a single color onto a label R6000 Series Halogen-Free Resin Formulation offers excellent solvent, scratch and heat resistance when printed on the appropriate label material Recommended for printing on glossy or very smooth label stocks, such as B-483 Ultra Aggressive Polyester and B-423 Permanent Polyester from Brady Combine Brady label materials with their recommended ribbon series for superior legend performance