Qingshui Bottles are made of high-grade borosilicate glass, which is known for its superior durability, chemical and heat resistance, and is typically used for high-end laboratory equipment and glassware. Unlike plastic and stainless steel alternatives, borosilicate glass will never impart flavors or leach chemicals into your beverages. NOTE: Although this bottle is sturdy, it is made of glass. Please proceed with caution. Hand washing the lid is advised. Please do not freeze the bottle. Although the bottle is dishwasher safe, it is fragile and should be handled with care. BUY WITH CERTAINTY