steel shim head gaskets ?

Are steel shim head gaskets made of embossed steel like they are described as or are they made with a composite material like felpros?
I've seen a pair on the internet saying they were the steel shim gaskets but they looked like they were composite like felpros. this image is for a 273 head gasket and it does not look like a steel shim gasket at all . what gives?

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