Morphing Mugs Personalized Harry Potter Slytherin Sorting Hat Heat Reveal Ceramic Coffee Mug - 11 Ounces - ADD YOUR OWN NAME TO YOUR HOGWARTS HOUSE! Color changing, Heat-activation reveals hidden image Ceramic Mug, 11oz in size, weighs 1lb Officially licensed Harry Potter mug designed and printed in the USA by Trend Setters Ltd. Authentic Morphing Mugs(TM) heat-sensitive mug ADD YOUR NAME(S) - Personalize this mug to display the name(s) you want, makes an ideal surprise gift for a Harry Potter fan!