TEAlice 21 OZ Glass Filtering Infuser Tea Maker Teapot With a Warmer This beautiful tea set comes with a 21 oz teapot with a removable filter cup. All pieces are made entirely of heat resistant borosilicate glass. Good for hot, iced tea, coffee (bag cofee) brew; Elegant and modern design. The roomy removable filter allows tealeaves to expand and provide full infusion of the leaves. It is easy to brew loose tea. Just put the tea into the inner cup and add some water, then the inner cup releases infused tea directly into the outside teapot.