This is a coffee cup, which is made of high-grade material, and can be used for a long time. This coffee cup can change its color when hold the hot drink. After the cup discoloration, the original color will be restored after cooling. Pour it into a solution (such as hot water, hot coffee, or any other solution, at least Celsius) and the color disappears and the hidden image is revealed. Features -Color:Black -Material:Ceramic -Size:9.60X8.00X8.00cm/3.77X3.14X3.14in -The edges of the coffee cup are smooth, which will not hurt your mouth when drinking. -The coffee cup is great for various drinks such as coffee, tea, water, milk, fruit juice etc. -The product is suitable for restaurants, cafés, dessert shops, home, office and other places. -Adoption of , the product is sturdy and for long-term use. -A wonderful housewarming gift for your family and friends, they will be appreciated the gift. Package list: 5 x Ceramic Mug