Did a little test today on the roll bars, made a little scratch at the bottom were the rubber grommet sits. It seems to me that the roll bars are steel with some sort of plasticized coating/paint rather than a cover. I have a contact at Karmann Gmbh, maybe she can find out exactly what they are made of might take a while though. I have had my eye on the CTD-Germany chrome roll bars for quite a while and will more than likely go that way, would like to find something cheaper in price though. A member of our forum GTA87 has the CTD-Germany chrome roll bars on his Roadster, he is extremely happy with the quality and fit and said they are definitely worth the expense.