HEALTHY AND DURABLE GLASSWARE:Hand blown borosilicateglass is lighter than the normal glass,but durable and stable.100% lead-free,BPA-free ELEGANCE WRAPPED AND IDEAL GIFT:The double layer glass mugs wrapped in an elegant and stylish gift box is the ideal gift for your family or friends especially on special occasions NEVER BURN AND INSULATION:Double wall design can prevent from burning hand,keep your beverage hot while keeping your hands cool PERFECT FOR ESPRESSO MACHINE: 5 ounces capacity is well matched with espresso machine as well as small coffee maker, perfect for cappuccino, shot espresso 30 DAYS FREE REPLACEMENT:Customer satisfaction is CnGlass top priority.If you are not satisfied with our clear coffee mug,we promise to offer a replacement or refund.Buy it with confidence please. When you weak up,enjoy your first cup of coffee with CNGLASS coffee mugs.It's going to be full of good mood all day,and your life will immediately be more colorful.