It’s Corian, a material used for countertops. Not finished like we normally would think of finishing speakers.
Just an add on. Been a hot minute since that cat posted this on that other site. I can’t go back and look, but I can add that he is a professional contractor who works with that stuff.
It was not cheap, even for him as an insider. And as cool as those look.... you should just buy from Jim and pay for the sexiest veneer you want!
