It happens a lot more often than you think: Spark plug wire failure due to engine heat ruining your spark plug boots. The Insulboot from Heatshield Products is a spark plug boot heat shield that solves this problem. The Insulboot slides over your spark plug boot in seconds and goes to work immediately, protecting your spark plug and boot from up to 1200 degrees of continuous heat. Double wall construction provides superior protection. Special coatings allow boots to reflect and dissipate heat. You'll extend the lifespan of your spark plug wires, prevent misfires, and enjoy peace of mind. Universal design fits over most spark plug boots, even 90 degree boots. Easy installation: place ring side on end of spark plug boot and slide the open end towards the wire. Insul-Boot Size: 1" Inner Diameter and 6"Long. Price is for a package of 8 Insulboots in the color Yellow.