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!!? The product has double layer glass and thermal properties. A total of 2 items are sent. 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. 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!!? We recommend hand washing.
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