Officially licensed color changing, heat-sensitive ceramic mug Heat-activation reveals hidden image 11oz in size, weighs 1lb Made in the USA with imported parts For long-lasting results, handwash only. Do not microwave. Kara Zor-El is sweet but mighty on this officially licensed Supergirl Heat-Sensitive Mug. Add hot liquid and watch the mug turn from black to the vibrant blues, yellows, and reds of this adorable Supergirl image. Drink your morning coffee as Supergirl swoops around the sky, making sure your day starts free of injustice. The exterior of this officially licensed 11oz mug transforms from black as hot liquid is added, revealing the hidden image in full vivid colors.