i purchased this rack. the rack is solid pvc, not expanded or controlled density. the are tougher than nails! lol. this guy is local to me and i saw his shop and how they were made. i was very impressed. these are very good quality racks made to last for decades. these are made with a cnc computer router and every one is identical. check out the link, they are not cheap and not trying to be cheap either.
http://market.kingsnake.com/detail.php?cat=22&de=390489


vaughn