Incredi-Glass

Smash it, no matter what, not even a scratch!

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In the winter it can make the inside warm, and in the summer it makes the inside cool. Also it's programmed for blocking the sunlight, and you can turn and turn off with that system with the remote controller. Also it's safe from TNT!
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It only cost 15 dollars for 30 feet width and 30 heights, with remote controller!