Show your love of the Harry Potter book series with this heat-sensitive color-changing ceramic mug. This beautiful collectible features official cover art of Harry Potter and the Deathly Hollows. Watch as the exterior of this 11-ounce Harry Potter The Deathly Hallows Book Morphing Mug magically transforms from black as hot liquid is added, revealing the hidden image in full vivid colors! Do not microwave. Hand wash only. Not dishwasher safe. Measures approximately 5 inches x 5 inches x 4 inches. Ages 15 and up.