LEDAUT Spark Plug Heat Protector Insulating Fire Sleeve Spark Plug Wire Protector - Black 8 Cyl 6" long spark plug heat protector insulating fire sleeve(Pack of 8) LEDAUT spark plug boot cover is made from fiberglass material,it is non-flammable,extreme protect the spark plug boots and wires. Universal spark plug boots fits for most angled or straight boots. The spark plug wire protector reduces misfires and enhances performance and extends life of wire & boots. The 8 CYL spark plug boot extends life of coil on plug bootsresists chemicals damage.