oh yes, thats right. Faux clays. I forgot the term for them. I've wondered who made them, because they guy I bought them from didnt know anything about them. Had to be a degen from the old days (before I got involved)
Acquired in the "good old days". Prices were low, lots of options and easy to find on Ebay. It would be a lot harder to build a big set these days. And of course, a lot more expensive.