MADE IN THE USA These boots are designed to lower the dangers experienced by exhaust manifold and extreme header heat. The boots will protect your spark plug wire boots and wires from heat up to 1,200 degrees Fahrenheit. (648.8888889 degree Celsius) The Boots are made from a high tech composite material. They are easy to install Will fit most 90 degree and straight boots Set of 8 Made In USA and Shipped from USA