Six months ago, we bought home a teapot of 600 ml. made of glass (art. 9447). As written on the borosilicate glass packaging. Reliable heat-resistant glass. The most important thing is to use any cookware, whether it is heat-resistant or non-stick coating of dishes, in proper operation. Do not expose the sharp contrast of cold and hot, do not wash with an abrasive, and the dishes will last you a long time. For brewing leaf tea, as well as we often brew chamomile, there is a very interesting filter. It looks like a spiral, which is located in the nose. It is very easy to take out and also easily inserted. Does not oxidize, although metal, but high-quality stainless steel. Easy to clean the kettle. And it looks very nice in my kitchen.