Made of high quality heat-resistant borosilicate glass, the special surface reflects the light well, creating the charming new look. Comes with perfect matching walnut lid and handle which efficiently insulates the heat and maintain a sense of design. Withstands -4 degree F to 260 degree F, instant hot and cold without bursting. Designed for tea lovers, suitable for dipping, black tea, green tea, scented tea, oolong tea, rose tea, fruit tea, loose leaf tea, coffee, etc.