Durable and Sturdy:NIKKIER glass water bottle is made of sturdy glass and does not contain BPA. Durable and sturdy | 100% Leak Proof:Each stainless steel cap has a rubber ring that fits tightly against the bottle neck. It can effectively prevent leakage and air infiltration | Easy to Use: The wide-mouth Can make it easier for you to fill juices, tea, coffee, milkshakes, and more,but also easy to drink and clean | Good Package: Each package includes 6 18oz empty glass bottles and 1 sponge brush.Convenient for you to use.They are carefully packaged with a foam barrier to prevent them from being damaged during transport | Notes:NIKKIER glass water bottle the maximum temperature tolerance range is between 50 ℃ and 70 ℃. Excessive temperature can easily cause glass bottles to break