Forgiato Radurra Glass Wheels - The latest rage

Mag wheels, spinners, LED spinners are so 2006 the latest craze is glass wheels. They look simply amazing on any car and are priced at $ 5000 per wheel, so it definitely makes sense to put them on a $100,000 car. The only problem I can see with these beauties is cleaning them, obviously they are not made from glass but some toughened plastic.
If you are lucky enough to afford one head over to Forgiato.











These rims must be impact resistant and more importantly to me highly heat resistant. Can you give any indication of the material that is use in these rims? We are trying to find suitable materials to replace glass in windows that may be affected by bush fires.