Protect-A-Boots are made from a high temperature resistant glass fiber material and treated with a proprietary coating, Protect-A-Boots provide spark plug boot and wire protection from extreme under hood heat. Double-wall construction for added durability Helps prevent burn-through, hardening and cracking of boots Installs in seconds Universal-fits most straight or angled boots Withstands 1200F direct continuous heat Non-flammable and protects against chemicals and resists water