The Twin Tea Bottle Infuser is a combination of modern art and functional design. The double wall silicate heat resistant glass, Composed of borosilicate glass which is stronger and more heat resistant than regular glass, keeps the inner wall hot and the outer wall cooler. The leak proof lids make it a pleasure to use even when you are in a rush. Simply boil water, then add your favorite tea into the stainless steel fine mesh filter and insert into the locking lid. Pour hot water into the opposite side and close the lid firmly. The tea will rapidly infuse in a few minutes. Lids can be removed from either end of the bottle. The transparent body makes it easy to check if your tea has steeped enough