Custom Chucky Doll Horrible Series Morphing Mug Just plain black in color when it's cold, this magical 11 oz. mug will turn white and reveal your design only when filled with a hot beverage. Just add your coffee or tea, and watch your images come to life in vibrant color. 100% Ceramic. come in 11 Ounce with black handle. size:3.74 inches (H) X 3.23 inches (W)