Double Wall Glass Teacup

Double Wall Insulation - The double walled design of these tea cups aims to provide optimal thermal insulation for any and all beverages, preserving their temperature longer as well as avoiding you any nasty burns.  Heat Resistant Borosilicate Glass - In creating these cups, Charbrew has used laboratory standard borosilicate glass so as to ensure that they are both durable and thin. As a result, these glasses are safe to go in the freezer. Avoid using in microwave and washing in dishwasher.