This teapot is made of thin heat-resistant glass. You can pour water at any temperature without fear. The nature of this teapot is very similar to the flask. But there are still differences. A glass cartridge, which we already love, is installed in the teapot for cooking. It has 12 thin holes for draining water. The size of these holes is so small that they do not pass through tea leaves and even tea dust. So, the tea in the teapot turns out to be clean.