Kablo bottles are made from food-grade borosilicate glass. Borosilicate glass is known for its superior durability. It is chemically unreactive, sanitary and thermal shock resistant, which is why it is the glass of choice for high-end laboratory equipment, restaurants, and wineries. Borosilicate glass will never impart flavors or leach chemicals into your beverage like plastic and stainless steel alternatives. Read more about it here.