Thermo Tec Heat Sleeves protect wires, cables and hoses from high-temperature exposure, liquid spills and temporary exposure to flame. Perfect for applications that may be close to open electrical sources or for ignition components. Reduces potential interference that may occur from other silver metallic styles. The high-quality sleeves are made from braided fiberglass sheathing and coated with a compound silicone rubber. Capable of continuous protection to 500º F and short-term exposure thru 2200º F. Available in silver or black and in 1/2", 3/4" and 1" diameters. Made in the U.S.A.