From Tea Forte:

Make iced tea into an entertaining event! Our Tea Over Ice® Pitcher Set includes two hand-blown, heat-resistant Steep & Chill™ pitchers that stack for a dramatic tableside presentation. To make iced tea, simply place any one of our Tea Over Ice pyramid tea infusers into the lidded top pitcher, steep, and pour the freshly-brewed tea into the ice-filled lower pitcher to flash chill in seconds. The proportions of hot water, tea, and ice are perfectly balanced to produce 24 ounces of iced tea with each tea infuser.