The Duo series consists of double walled glass teapots and various double walled glasses. The material is made from borosilicate glass which is very resistant to temperature changes. The space between the glass walls of the teapots functions as an insulator thtough which the tea keep their heat. The double walled glasses have the same construction: Due to the space between the glass walls keep hot drinks their heat and keep cold drinks their pleasant cool temperature. Besides that, the double walled glasses have the advantage that no condensation develops on the outside.
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