Our mugs are all made of high quality ceramic, it can work longer. Pour in the hot liquid and the logo magically appear. This mug is perfect for tea, espresso, and anything other liquid, especially for hot liquid. You will be able to determine whether the coffee is cold by the color of the cup, so as to avoid drinking cold coffee. Hand washes only. Not microwave or dishwasher safe. It's a surprise, not just a cup. For your friend or family member, in any holiday, the magically cup would be a good idea to bring joy into your life, especially at Xmas. Mug support customized logo, logo process for heat transfer. The prices for 600pcs or over are based on ocean shipments.