High performance road and racing cars demand high performance from materials. Because high performance must be coupled with reliability, most constructors of such cars take a very conservative approach to materials selection, but some boldly break ground by using more advanced materials. Aluminum, magnesium and alloy steel are the most commonly used materials. Titanium, plastics and advanced composites are used by the more imaginative constructors. Here is a survey of materials specified by some of the builders of high performance road and racing cars.