Description： Color：Black Length：6" (15.5cm) ID：1" (22mm) Rated for 1800°F continuous use, 2500°F intermittent Fits most spark plug boots even 90° Reflects and dissipates heat Double wall construction Always wear safety glasses, dust mask, gloves and long sleeves are recommended when handling this product High Quality Parts Professional installation is highly recommend.(No Instruction Included) 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. Made of Titanium that can hold 2500 degree F Eeay Installs, you can do it in seconds Double-wall construction for added durability Helps prevent burn-through, hardening and cracking of boots Universal-fits most straight or angled boots