These boot protectors are made from a high temperature resistant glass fiber material and treated with a proprietary coating, They provide spark plug boot and wire protection from extreme under hood heat
Sleeves Can Withstand Heat Up To 1200 Degrees Using Patented Insultherm Technology Sleeves Are Halogen Free& Non Conductive Sleeves Resist Gasoline& All Engine Chemicals
Insulterm Spark Plug Wire Sleeves Can Rest Directly On Hot Headers And Other Engine Components Without Burning,Melting Or Becoming Brittle