Note: Our Item is made of Borosilicate glass ,NOT a normal glass! There are some other sellers pretending to use low-quality (industral Glass) glass to pretend to use Borosilicate glass (Cheaper but dangerous). COMPLETELY HAND MADE：Hand blowing from high quality chemistry grade borosilicate makes these glasses thinner, lighter, capable of withstanding thermal shock, scratch, and break resistant.feels great to hold it in your hand. Product Name: Glass Tea Capacity:250ml/ 300ml / 400ml Color: transparent Material: High shed silicone glass -5℃ to 150℃ Microwaver/Diswasher/ Freezer safe Suitable for: cafes, offices, homes, bars, dessert shops, etc. Suitable for: coffee, juice, drinks, cocktails, milk, etc. * Please allow the little error of the manual measurement.Consider it before buy it. Thank you！ ***This is a thin glass，it cannot be hit by a single point click, so when using a spoon and glass straw, you can't poke it hard, and the ice cubes need to slide off instead of being placed high fall .