To be honest the seller has his doubts about the system being SS now. I googled IMCO and really didn't find anything that would indicate WHERE this system came from and as Darrell stated it's probably a private label. I'm thinking it is an aluminized steel system but will know more when it gets shipped to me. Rick's system goes for around $700.00, same for others I looked at, ebay has them for around $570.00 with hangers. So whatever it turns out to be, I still think I got a deal.