1.Material:borosilicate glass 2.mouth blown hand made 3.Tolerance temperature:+/-180 C 4. offer OEM service Details:Material is borosilicate glass; mouth blown is hand-made. It can be usd for making tea, coffee, water and so on.It is beautiful for making blooming tea. like a flower in the pot.Temperature range from -180 to +180 degree. Safely used in microwave or fire stove.Could use dishwasher ...