1.3.3 borosilicate glass 2.Strong, but lightweight 3.Produce and sale by ... logos are welcome.2. These mugs made of heat-resistant borosilicate glass are especially strong, but very lightweight.3. Keep hot drinks ... . ODM and OEM orders are welcome!12. Note: Each glass is carefully mouth-blown by skilful craftsmen, so there may ... abroad to visit our plant, visiting and cable-like. Borosilicate glass mugs