These are OEM steel, on my Superbeetle. The cryogenic tempering cost about as much as the raw part.
Quote:
https://www.thoughtco.com › cryogenic-hardening-2340006
Introduction to Cryogenic Hardening of Metal - ThoughtCo
Besides steel, cryogenic hardening is also used to treat cast iron, copper alloys, aluminum, and magnesium . The process can improve the wear life of these types of metal parts by factors of two to six. Cryogenic treatments were first commercialized in the mid-to-late 1960s.
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