Orange Heat Protector Sleeve Spark Plug Wire Boot 8 Cyl These Fire Boots are designed for extreme protection of spark plug boots and wires, in excess of 1200 degrees Fahrenheit. (648.8 Celsius) Fit is universal for most angled and straight boots. Helps reduce misfires, Extends life of wire & boots Non-Flammable, Resists damaging chemicals Easy installation, Looks great