Im pretty sure they are glass, someone can correct me if I'm wrong. I broke one in the first three months I owned my SVT. I bought an eBay replacement for 38 bucks I believe. They quality is actually pretty good I was impressed. But yeah +1 for the lamin-x I put smoked on my car though. Haven't had a problem since and it's been over a year.
03 Ford SVT Focus JRSC BBK
The Bad Cat (97 Merc Cougar XR7)