Piece heat insulated borosilicate glass cupthe product has double layer glass and thermisile properties. heat resistant, stylish, elegant and double-walled design. it is made of high quality borosilicate glass. do not let your coffee get cold at home, at work, in the office. 300 mlborosilicate glass has a granite-like structure, it is very difficult to wear, does not scratch. as it provides resistance to high temperatures, it 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 is not a defect. we recommend hand washing. Create a party-ready atmosphere with this colorful LED lighting. Easy to install and perfect for events or home decoration.