These ceramic speakers from Joey Roth are made from porcelain, cork, and Baltic birch. Except for the internal componets, there is no other plastic.
An included amplifier is made from stainless steel, a cast iron base, and a Paulownia slider. You have to admire the sleek lines and restraint going into each of these. I would expect them to be handmade but I'm not sure. Link: 450