Product Descriptions: Spark Plug Wire Sleeve Spark Plug Sleeve provide the ultimate protection for spark plug boots and wires from extreme temperatures generated by vehicle exhaust headers and manifolds .It prevents burning and cracking that could lead to engine misfire and damage. The Boots are woven with two layers of high temperature fiberglass or titanium material. Keep your wire and boot cooler in a high temperature environment. Titanium Made of Titanium that can hold 2500 degree F Part no.:PWS-T-01015 Color: Titanium Brown Features: Rated for 1200°F continuous use, 2500°F intermittent. Each boot is 6" long (15.5cm) .