Double Wall Insulated Glass Mugs: The double walled glass coffee mugs keep the temperature of liquid hot or cold for a longer period of time while the outer glass wall remains comfortable to touch. Moreover, our mugs also keep iced coffee cold longer than a porcelain or ceramic cup. Superior Borosilicate Glasses -100% lead free- This insulated coffee cups are made of premium quality materials, which is more durable than normal glass, with high temperature resistance from -20~150/ -4~302F. Can be used well in the microwave dishwasher and in even the freezer. 12 oz/16 oz Two Size Capacity For Daily Use: Each glass coffee cups boasting a unique curvature that holds 12 oz/16 oz which is large enough to nicely go with espresso machines or coffee makers. The clear coffee mugs serve the perfect for tea ,espresso, latte, cappuccino. For All Occasions: The clear glass coffee mugs give a smooth finish and a crystal clear look, creating a nice feeling in hand, its a perfect addition to your breakfast and afternoon teatime. Clear coffee mugs could be the ideal gift for your family or friends especially on special occasions. Guarantee Service : In case you are not satisfied with our mugs, or if theres any damage during transit, we guarantee to offer you a replacement,or just refund you the money. If you have any questions, please feel free to contact us and our team will give you a satisfactory answer.