High borosilicate glass (also known as hard glass), is a special type of glass that can withstand high temperatures and has a low coefficient of thermal expansion.
Low expansion rate, high temperature resistance, high strength, high hardness, high transparency, and high chemical stability are its special attributes that distinguish it from ordinary glass.

Boiling water is poured without breaking

Cup height: 21cm, diameter: 6cm (measured by hand), capacity: 500ml
Packed in 48 pieces
The following are detail pictures: