"We're with you, whatever happens." - Ron Weasley. Remember the epic Harry Potter series with this remarkable Harry Potter Ron Weasley Morphing Mug. The 11-ounce ceramic mug transforms from black to a vivid full-color image when hot liquid is added, and it weighs 1 pound! Approximately 4- inches tall. Hand wash only. Not dishwasher safe. Do not microwave. Ages 13 and up.