The exterior of this officially licensed mug transforms from black as hot liquid is added, revealing the hidden image collage in full vivid colors. The Harry Potter Professor Snape Always Morphing Mug is beautifully designed in a watercolor background and a silhouette of Snape's Patronus-the doe and the iconic conversation between Snape and Dumbledore. Now you can relive this iconic moment with this unique mug! The 11 ounce mug stands about 6-inches tall. Do not microwave. Hand wash only. Not dishwasher safe. Ages 13 and up.