Fiberglass, with a temperature resistance of approximately 1000 degrees Fahrenheit. The titanium color of the spark plug sleeve is basalt, and it can withstand high temperatures of approximately 1500 degrees Fahrenheit.
Product features: Double-layer structure, increased durability, mainly protects spark plug sleeves and cables from the temperature effects of the vehicle's exhaust manifold and headers, keeps cables and boot coolers in high-temperature environments, which helps reduce burn-through, hardening, and cracking of dust covers that can cause engine failure and damage.
【Protective Cable】：Spark Plug Wire Heat Shield is often used as a solution for your burning spark plug wires that generate a lot of heat. These universal spark plug wire covers can provide good heat protection for spark plug wires, especially on engines with excessive exhaust manifolds.
【Perfect Use】：Spark Plug Wire Heat Shield works well with 90-degree, 45-degree, and straight spark plugs. Fits most hot rods and classic engines. Also fits most angled and straight boots.
【Material】 ：Spark Plug Heat Shield Sleeve Made of fiberglass material. The thick material is long enough to protect spark plug wires when they approach the manifold or exhaust manifold, helping to increase cable life and maintain maximum spark as long as you keep your vehicle. It can withstand heat up to 2500 degrees intermittently.
【Easy Installation】：Spark Plug Protector Easy to thread the boot heat shield onto each boot of the spark plug wire. Just thread the large end (with the sewn seam) over the boot. Then gently thread the ringed end over the item that connects.