Product Review
Why is there a hole in the bottom of the clear coffee mug?
The double-layer cup is not vacuum mug. There is an air outlet at the bottom of the outer layer,  which is used for the manual blowing process to discharge the gas.
The atmospheric pressure between the inner and outer layers is balanced to prevent the clear mug from deformation and cracking. After the production is completed, the hole will be sealed with glue. (If the mug is vacuum, it will make a loud noise when it's broken, and it will blow up the glass fragments, which will hurt people easily.)Therefore, there is an adhesive hole in the bottom of the clear mug, which is required by the process ,it's not flawed or defective.
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PLEASE DO NOT WASH OFF THE GLUE ON THE HOLE .
Warm Reminder:
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1. It is recommended to use toothpaste when cleaning stains such as tea or coffee stains .It's much cleaner and won't scratch the mug .
2 It is recommended to use a wooden stirring rod to avoid scratches.
- Are you looking for a mug which can protect your finger when you enjoy hot or cool drinking? Go well beyond brand, PunPun is leading a fancy lifestyle. We also striving for promoting healthy habits , as well as the practicality .
- 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 .
- 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.
- Customer satisfaction is PunPun top priority. In case you are not satisfied with our mugs, or if there’s any damage during transit, please tell us, we will offer you a replacement, or just refund you the money. SIZE: 12.9 ounce. 380ml
- We provide 365 days after-sales service.
