15oz heat changing ceramic mug. When the hot liquid is poured, the surface of the heat sensitive coffee mugs will change color, and the hidden picture will appear and disappear (will term solid black) when the mug is cold. 
Lead-free and chrome-free. 
Dishwasher and microwave safe 
Height: 12cm/4.72 inches
Width:8.5cm/3.3 inches.