Accel 8 mm Super Stock Black Spiral Wire Set is designed to provide high spark delivery for street driven vehicles. It features a high temperature silicone cover over a fiberglass inner braid and high voltage insulation for long lasting durability. This copper wire set includes silicone jacket which is rated at 450 degrees and is extruded over a tightly woven fiberglass braid. It is easy to install and is backed by limited life time warranty.