Protect-A-Boots solve the problem of burning and cracking plug boots and wires from header and engine heat. 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 and helps prevent burn-through, hardening and cracking of boots. Our 6'' Protect-A-Boots come with a reinforcement ring at the base for easy plug removal during maintenance. When working on boots with tight bends, try our Protect-A-Boots Ringless instead. For thicker boots, like MSD or Taylor's, we recommend our Protect-A-Boot(TM) Ringless Sleeves; its larger diameter will allow for a simpler install. Non-flammable & protects against chemicals & resists water Universal - fits most straight or angled boots 1 in. internal diameter Double-wall construction for added durability