The glasses look nice, but I could immediately tell they are plastic by look, feel, weight and the noise they made when they clanked. So the marketing description is a little overstated. However, if you are looking for non-breaking high quality plastic drinking glasses these glasses are what you are looking for. In my video I dropped them onto a tile floor from the height of the kitchen counter with no ill effects - the glass did not break and had no scratches. Each glass weighs 8.9 oz.
They work well not only with cold drinks but hot drinks as well. Because plastic is less conductive than glass these glasses do not feel hot when they are filled with hot water for hot tea or coffee.
You can find it on Amazon by following this link.
Ali Julia review ★★★★☆