About This 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. Overview Brand : CNGLASS Material : Glass Color : 5oz(4-pack) Capacity : 150 ml Special Feature : Break Resistant, Heat Reveal Technology