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I cannot image making them out of glass, very dangerous! Most of the stock one's are Plexiglass. That can shatter too and scratches easily. My original Plexiglass one broke when a can of paint fell on it during the 1994 Northridge earthquake. I am so glad that's all that happened to the car.
Lexan is much better stuff, virtually unbreakable. However basic Lexan also scratches easily. The best stuff is 3M Lexan MR10 which is hardened to prevent scratching. That is the bulletproof stuff that lasts for years. The biggest problem is that after you cut it to size, it is so tough that it takes a long time for the power sander to round and smooth the edges.
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"It doesn't have anything on it that doesn't make it go faster."
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