Installs in minutes... Protects for years. Insulating sleeves are completely non-conductive, resist all engine chemicals and will provide an easy, economical solution to the challenge of Wire protection in the cramped, high temperature environment of any high performance engine compartment. Installs easily over most standard plug/boot/cable combinations, even molded or right angle boots. Can even rest directly on hot exhaust headers with no effect. Protects your expensive and delicate spark plug cable set from engine temperatures up to 650°C (1200°F).