Double walled glass double wall glass latte & tea & coffee glass Made of heat insulated borasilicate glass Keeps your drinks hot & cold for longer It does not burn your hands thanks to its double glass glass structure Stylish and elegant design Latte & herbal tea & coffee glass 500 ml Suitable for washing in the dishwasher It is not. Not suitable for microwave oven. Borosilicate material resistant to heat shocks and impacts. Manufactured by hand. There is a round mark on the bottom of the glass due to the construction of the double-walled glass. It's not a defect!!?