Instruct: Classify Amazon reviews into positive or negative sentiment
Query: These glasses are made from polycarbonate, aka bisphenol A or BPA.

These glasses are unbreakable because they're made from solid polycarbonate, aka BPA. Likely in a few years this item will no longer be on the market due to health concerns. BPA has been linked to birth defects and certain types of cancer. Stick with safer materials such as stainless steel, glass, wood, ceramics or silicone for your food and drinks!