Steel, coated with something, half of which didn't twist, I had to clean the threads with a tap. They can rust, as is common with ferrous metals. I thought they were brass but maybe I didn't look closely to really find out. The steel is real, it's strong. So if you're using them on skin that doesn't absorb sweat or moisture there probably won't be a problem, but the steel is very strong so I'm guessing you won't break them. Once the streams are cleaned up and running they seem to be doing pretty well. The gold color is nice too, not sure how many microns of coverage. Installing them will give you gold flakes, which seems normal for such a plate system. Maybe made overseas in Asia?
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