Designer glassware : Double wall design borosilicate insulated glass mug is for tea and coffee lovers. The PunPun coffee mugs set-heatproof insulating-clear mugs with handle,12.9oz,and hand made. Coffee mugs keeps the temperature of liquid hot or cold for a longer period of time while the outer glass wall remains comfortable to touch. Moreover, PunPun clear mugs also keep iced coffee cold longer than a porcelain or ceramic cup. The PunPun clear glass mugs are very easy to clean, and it's freezer safe . Top quality: We use high-purity high borosilicate materials that meet the standards of edible equipment and ensure the durability and environmental friendliness of the glass cups. More exquisite craftsmanship:Ensure that the thickness of the inner and outer walls of the double-layer cup is consistent, and the cup mouth is smooth without water hanging. For all occasions: PunPun clear mugs serve for tea ,espresso, latte, cappuccino. The entire glass is so clear that the coffee seems to float in air, it’s a better addition to your breakfast and afternoon teatime . What’s more, all lines are smooth and daintiness, creating a nice feeling in hand. PunPun clear mugs could be the ideal mugs for your family or friends especially on special occasions.