40 yards of Nomex Thread on one Metal Bobbin Great for race suit patches and minor repairs Item shipped: 40 Yards of Nomex Thread on a METAL BOBBIN (as shown in picture). Excellent resistance to heat exposure (Nomex thread is not fire proof). Flame-resistant characteristics remain after laundering or dry cleaning. Please note: actual color may vary from picture due to computer setting. Details on Nomex can be found on the DuPont website. Google search "DuPont Nomex" without the quotes. PLEASE READ: All our FR materials, thread and products are re-tested by the SFI Foundation every 2 years. The SFI Foundation tests have specific methods and conditions in which the tests are performed. Holding a Bic lighter under a piece of Nomex thread is not the proper method to test fire resistant threads.PROFOX RACING is a current member in good standing with the SFI Foundation and has been for over 15 years.