So I have to say BS it's actually Pyrex. They become extremely brittle when exposed to relatively moderate heat and then break very easily. Weather or not, they're actually borosilicate glass, I can't tell you that. If so, then they appear to be of poor quality. I'm not an expert, but I've used real Pyrex (borosilicate is actually made by Corning) and it's not. For the price I should have known. Good
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