HEAT ACTIVATED - Pour in hot liquid and watch out as the Zombie magically appear. This color-changing mug contains the living dead inside. In order to activate the mug the temperature of the hot liquid should be over 70C/158F. At that temperature the color of the mug will change to reveal the zombie. HIGH QUALITY - Grade A quality ceramic with cool design, this mug will bring a smile to your day when you wake up in the morning and have that first cup of joe, tea or hot chocolate. ARTWORK ON BOTH SIDES - Unlike most color changing heat sensitive mugs this authentic Zombie Mugs mug has high quality artwork printed on both sides of the mug. 11 OZ CERAMIC MUG - with Artwork - Like all color changing mugs this mug is NOT MICROWAVE OR DISHWASHER SAFE, hand wash only! Placing mug in dishwasher or microwave could ruin the art as for all heat changing mugs. Also we do not recommend leaving mug in soaking water as it could also damage artwork! This quality collectible is a unique addition to any fan's set. Give this cool collector's merchandise to moms, dads, fans, grads, kids, guys, and gals who love pop culture fun!