Whatever you do, don't let the Muggles get you down! This remarkable color-changing Harry Potter Don't Let the Muggles Heat-Sensitive Morphing Mug transforms from black to a vivid full-color image of Harry's iconic glasses and the words "Don't Let the Muggles Get You Down" when hot liquid is added! Made of ceramic, it holds 11 ounces and weighs 1 pound. Hand wash only. Not dishwasher safe. Do not microwave.