[QUOTE=Mrmiata

Edit..edit..edit..
After looking at your pics.. and your description of "don't feel like glass...".. I'm thinking tempered glass.. which could be thinner.. lightweight.. and expensive to replace.. like the 400 dollar price tag that comes with used ones? What do you get when you sand on glass? A highly undesirable result?[/QUOTE]

Ok - my 2 cents worth, they are glass. I wanted to remove the pitting so I got out my Dremel and used a coarse grade sanding disc. To my horror the disc dug into the glass and scuffed it and I thought I'm only making it worse! Not to be deterred, I put the finest disc I had on the dremel and I was able to polish out the scuffs as well as remove all the pitting. see post #754