When slowly turning the coffee cup while its picture is in the front, its hidden picture appears and disappears between the broken pattern and saggy shape. Endangered Animals If reflecting the distorted image of the animal of the coaster into the mirror cup, the original appearance of the endangered animal is revived in the cup finally, here contains the message to ask small attention to such an animal. This product also won the Gold Prize at the 2014 Seoul International Invention Fair. Some of profit from products related to this theme will be donated to WolrdWide Fund for Nature (WWF). Details - Contents: 1Cup, 1Saucer - Dimention: D64 x H54 (mm) / Saucer: D132 x H20 (mm) - Volume: 900ml - Material: Porcelain - Made in Korea For Porcelain - Not for use in dishwasher or microwave. - Wash it with a soft cloth if possible. - Water stain does not remain when water is completely removed after washing.