This tea mug with lid is made of food safe non toxic porcelain that also provides high durability. It comes with a food grade stainless steel infuser that makes it safe for infusion hot water and corrosion free. The extra fine holes makes it perfect for loose leaf tea and brings out the natural flavor of your favorite flower or leaf tea. The convenient lid keeps the content hot and away from dusts when not drinking and also serves as a coaster for your strainer.