Zen Room All Glass Made Double Glass Tea Infuser & Mug Teapot 13oz Ultra-Clear Borosilicate Glass with Glass Lid and Glass Infuser Heat Resistant and Easy to Clean. DOUBLE GLASS DESIGN- The roomy glass infuser allows tealeaves to expand the aroma completely and provide full infusion of the leaves. The double layer borosilicate glass is insulated thermos. HEALTHY AND ENVIORMENTAL CHOICE-No peculiar smell: Our glass is made of borosilicate glass (also known as hard glass) which is BPA and lead free Also the lid is made of food grade stainless steel. The crystal grade glass is ultra-clear, sturdy, low inflation, high heat and cold resistant with high chemical stability. EASY TO USE- Easy to brew loose tea. Simply put the loose tea into the glass tea infuser and pour hot water, then the inner cup releases infused tea directly into the outside teapot. EASY TO CLEAN-All parts of this tea pot is removable. Dishwasher and microwave safe. Zen Room GURANTEE-For whatever reason, If you are not 100% satisfied, simply contact us to return the Tumbler. We will give you a full refund or send you a replacement.