Made of 100 percent borosilicate glass, the glass bottle keeps your water perfectly pure and 100 percent safe. The cylindrical shape ensures that it fits easily into the side of your refrigerator, so you can use it to store your water and juices in your fridge, or even to carry it around. They can be safely used in the microwave, oven, flame, fridge, freezer and dishwasher. Unlike plastic or ordinary glass, they will not leach chemicals into your drink even after repeated usage. They Retain perfect clarity. Unlike regular soda lime glass, will not turn cloudy with repeated usage. And they are harder and tougher than ordinary glass and scratch resistant