SAFE, STRONG BOROSILICATE GLASS: These espresso cups ​are made of heat and condensation-resistant borosilicate glass, which is stronger and more durable than common glass that gives a smooth finish and a crystal clear look THE IDEAL CUPS FOR YOU: Set of 4 handmade, double-wall coffee mugs, each mug boasting a unique curvature. These double walled glasses will suspend your hot or cold beverage within an inner wall, creating the engaging effect of your drink floating. Enhance your coffee indulgence experience! [Microwave and Dishwasher Safe] - Double insulated coffee mug give an extra luxury look in your coffee time or dining table. It's more heat-resistant, high transparency, thinner and light weight, but more durable than normal glass. It’s suitable for dishwasher and microware oven. [Double Layer Design] - Beautiful design with the benefit of the double glass wall to keep the cup cool to the touch. The handle is made of heatproof glass material. So you don't have to worry about if your hands will be burned when you drink hot tea. This is incomparable to a single-layer glass or ceramic cup. [365 DAYS GUARANTEE] - If you have any questions about our Glass Cup (or products), please contact us. We will gladly take care if your issue 24hs, 7 days a week! Our after-sales team will help find a solution. This glass mug is with modern and elegant double wall design, it is ideal for tea, juice, lungo, latte, cappuccino, espresso, demitasse, smoothie, juice, chocolate as well as any desserts. Highly recommended for hotel, café, home or office use. Trust us, you will fall in love with these double layer glasses. They are simple and extraordinary, and they have gone through more than 30 processes to complete. Designers give them life and integrate them into your warm family. When you give it to your friends and family, they will think of you in the beautiful morning. If the product you received has been opened or cracked, please confirm with us. We will give a perfect solution to you.