GRETZOMALL Tea infuser bottle is made of thick borosilicate glass, which is resistant to rapid temperature differences.This tea infuser bottle can not only be used as a container for tea, but the filter is also suitable for various fruit drinks. Can also be used as a water bottle when the filter is removed. This glass cups can also be used for tea,coffee ,bag coffee brew and milk.Portable ,you can use it indoor or outdoor travel. A well designed lid locks into place and ensures water will not leak out of your tea mug.Big mouth opening, easy to clean.This glass tea cup is a great gift for your friend and family. It can be used in many other occasions;wedding gifts, house warmings, birthdays Valentine's Day gift, Mother's Day gift etc.