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So like, we had it right with wood and leather after all?

After reading your comment, I've actually went to Google and looked up "wooden in ear headphones" and they actually exist! Fascinating!

Although, they still have silicone tips and the wood is probably treated with some kind of varnish for durability and aesthetics, so...

Quality silicone is probably the least worrying plastic material they could use considering it's used in implants and other medical applications.