DOUBLE-WALLED DESIGN: The double-walled coffee cup has an excellent thermal insulation effect, keeping your drink hot or cold for a longer period while the outer glass remains safe to touch; suspends drinks within an inner wall for an engaging visual effect PERFECT SIZE: Easy to hold and lightweight, ideal 350ml capacity for enjoying Latte, Cappuccino, Espresso, tea, smoothie, beer, juice, ice cream, and other hot or cold beverages; perfect for coffee stations near the coffee machine, meetings, frigid days, and parties FOOD-GRADE BOROSILICATE GLASS: The glass mug 350ml is made of heat and condensation-resistant borosilicate glass, accept the temperature from -10 to 100, which is lead-free and more durable than common glass USE WITH CONFIDENCE: Easy to clean and scratch-resistant, safe for microwave, not for use with metal utensils; this is the glass cup you want dealing with for best results MULTIPLE USE: Beautiful coffee accessories to any cafe, restaurant, pub, and your own home; get this excellent glass coffee mug to entertain your guests; they will be amazed at these glass mugs NOTE: For long-term use, please avoid contacting with sharp objects when cleaning, slowly hand wash with cloth is recommended. The safety hole on the bottom of the cup, which exhausts the air between two layers in production, is not flawed. TIPS: To avoid water entering the safety hole, please do not rinse the hole directly or soak the cup in water for a long time, do not wipe the safety hole forcefully.