This type of teapot is often made from heat-resistant borosilicate glass, and it typically includes a stainless steel infuser for loose leaf teas. The design allows users to watch the tea steeping process, appreciating the color and movement of the leaves. These teapots come in various sizes, commonly ranging from about 400ml to over 1000ml. They are designed with features like non-drip spouts and ergonomic handles for easy pouring and handling. Many are also stovetop safe, adding to their versatility.