As far as I can tell, the black version is almost entirely plastic. I have a copper version from another manufacturer that has little metal latches that you can pry off with a flat head screwdriver to loosen or tighten the lenses in the frame. They can make pretty decent goggles for protection from sand and mud, but they only have little plastic ribs that only loosely hold the lenses in place and let in tons of air, including fine dust. The glasses I was trying to replace were also $6, so it's not clear why copies are lower quality and more expensive.
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