FLEX FANThe thermodynamic design of Mr. Gasket's flex fans provides ultimate air transfer at all rpm's, thus reducing drag and increasing horsepower. Two different materials, stainless steel and aluminum allow you to choose the type that best suits your requirements for the street or track. Made of ALUMINUM, UNIVERSAL in design 18" diameter with an 8000- RPM LIMIT. Styled with Black Center and clear Anodized Blades.