Review on Crystal Coffee Tea Suns Borosilicate by Jacob Leon

Update: The cracked handle is still intact, and having used my brother's other coffee mugs with heated handles, I miss these glasses. I only hand wash them and only use them for tea. It cost $12 to be able to handle them with boiling water inside. One of them has a tear right out of the box but the other one looks fine. After rinsing a new glass and brewing my first cup of tea, I saw and felt a crack at the top of the handle. It works now, but how long does it take for the glass to break while I'm holding hot tea? The handle stayed cool in the microwave and can withstand a lot. It seems like it could be a good product that lacks quality control and/or the nature of this glass is such that it can have imperfections at times. For the price of a glass, imperfections that result in glass breakage are unacceptable, especially considering that if the glass eventually shatters (I use mine on mine) a person could injure themselves or damage documents that are near it computer desk). .