Step into the enchanting world of Harry Potter with this 11 oz Morphing Mugs Heat-Sensitive Mug. Featuring a stunning depiction of Hogwarts Castle by renowned artist Thomas Kinkade, this magical mug transforms right before your eyes. When cold, the mug appears black, concealing the magic within. Add your favorite hot beverage, and watch as the iconic Hogwarts Castle is revealed in all its glory against a misty, moonlit night. The exterior of this officially licensed 11oz mug transforms from black as hot liquid is added, revealing the hidden image in full vivid colors. While this mug may be used in the dishwasher or microwave, for the longest lasting, highest quality product, we strongly recommend against it.