This is a Yu Yu Hakusho Urameshi Yusuke Reigan heat-sensitive mug. When you pour in a hot liquid of about 60 degrees Celsius or more, the hidden design will appear! Size: Approximately 8cm in diameter, 9cm in height Specifications: Ceramic / Not dishwasher or microwave safe This is an unopened item, but it has been stored at home. Please understand this before purchasing. Please feel free to ask if you have any questions. I also have other anime goods for sale, so please take a look.