SWI Parts Spark Plug Protect Boot Heat Shield Thermal Protection Insulator 1 Inch ID x 6 Inches Long Pack of 8 (Red) Protect Spark Plug Boots and Spark Plug Wires Protect From Heat Up To 1200 degrees Fahrenheit 648.9 degrees Celsius Universal fit for most angled & straight boots Strong, durable and long lasting Easy to install; no tools necessary