This unique spark plug and ignition wire protector comes in red, blue, black and silver. These dual purpose sleeves enhance performance, reduce misfires, extend plug wire life and will not react with petroleum products. The double-wall construction keeps the wire and boot cooler in a high temperature engine. Its universal size fits most boots, is easy to install and is non-flammable. Cool-It Plug Wire Sleeves can be used in any temperature environment from street vehicles to motor homes. Sleeves are available in packs of 4 & 6.