They do appear to be some wild amalgamate, not regular stainless steel, though I do not see any air bubbles in that photo.
Not sure what do you mean regular, but the jaws are casted not rolled sheet metal like other parts. It's the standard methods and there is only one MT on the market I'm aware of that doesn't use casted jaws, but wire EDM cut tool steel jaws, and of course the price reflects that.
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