This thread is a flame resistant thread that was developed for aeronautics, fire and safety, motor sports and other areas where safety standards are specified. Fire Fighter is 100% Aramid which contains Nomex® branded fibers from Dupont®. (Nomex® is a registered trademark of Dupont®). It is available in 24 colors. Madeira provides Fire Fighter bobbin thread, bobbins and flame resistant Proban® backing in its E-Zee Backing and Topping™ division.