Heat Resistant Double Glazed Double Walled Glass Mug 2 Pieces 250ml GUEZIA Heat Resistant Double Glazed Double Walled Glass Mug 2 Pieces 250ml Thanks to the double glass feature, you can easily use your hot drink without getting burned or your hot drink getting cold. 2 PCS will be shipped. The product features double layer glass and thermisil. Heat resistant - stylish - elegant and double-walled design. Made from high quality borosilicate glass. Don't let your coffee get cold at home, at work or in the office. 250 ML Borosilicate glass has a granite-like structure - It is very difficult to wear - It does not scratch - It is resistant to high temperatures and is also resistant to low temperatures. 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!! It is suitable for machine washing.