Creative cocktail mug w/ Double wall mugs

S SPECIFICATIONS Shape: ROUND Quantity: 1 Material: Glass Glass Type: Transparent Drinkware Type: Glass Model Number: A-530-02 Material: High-Boron silicon glass Features: High heat resistance Function: Milk cup , Tea cup , Coffee cup , Wine cup , Beer cup , Juice Cup Applicable environment: Fridge , Dishwasher Style: Simple, Creativity For people: Male, Female, Children,Girl Friend,Boy Friend Use to: Business gifts, festive gifts, public relations gifts, BF/GF gifts [xlmodel]-[photo]-[000Tips The stomata at bottom is characteristicsof double layer cup . Not defect.