in the center, half inch leksan and water white and extra star fire on -- >> what is that water white or star fire do? >> it's extra -- glass has -- so the street layers cep them protected. they -- kept them protected. they haven't had any major burglaries to point. >> somebody is working on it. >> well the product has become expensive because of the three lawyers so they put an additional layer of mylar graffiti film over the outside so in case it's scratched then we pull off that sacrificial layer and put on a new piece of plastic which is cheaper than replacing that whole window. in terms of clarity, the regular glass is fairly green. and the thicker it is, the emreener it gets. this table here is a slumped piece of glass. and it's about two, two and a half inches thick. and that is just the natural color of regular glass. and from different minerals that are in glass, there's -- you know, when it's sand and soda, and whatever minerals are in the sand gives it the color of the glass. so that's copper and iron that are giving that green look. there's another product called star fire