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Production Methods: Metal Injection Molding (MIM)
Sort of a mix between die-casting and injection molding.
However MIM becomes viable when you need fine complex parts.
Based on the pictures of their example parts the resolution is nowhere near what would be required for the kinds of items above, but with the tradeoff that no mold-making is required.
Some common materials/alloys are stainless steel (precipitation hardened 17-4 PH, tungsten carbide, titanium and iron)
I had a set of Oakley Juliet sunglasses, which I believe were injection molded titanium. Looked dumb on me, but were seemed high tech at the time (1998).