The BLACK DIAMOND Pattern Tumbler Vacuum Insulated Coffee Cups Vacuum Flask Car Mugs Water Bottle is a high-quality, durable, and stylish water bottle that is perfect for keeping your drinks hot or cold for hours on end. It is made of stainless steel, which is both rust-resistant and BPA-free, so you can be sure that your drinks are safe to consume. The vacuum insulation technology helps to keep your drinks at the desired temperature for up to 12 hours, so you can enjoy a refreshing cold drink on a hot day or a warm coffee on a cold day.