... Dishwasher and microwave safe This double wall double wall glass beer cup is great for latte, tea,juice,water ... double wall glass beer mug material is heat-resistant borascilicate glass, it is stronger than traditional glass and can ... from drinkware to cookware.It is medical grade glass,good for health,Eco-friendly,more resistant ... Factory: Production Process:SGS Test: borosilicate glass double beer cup