Just add your favorite hot beverage and watch this mug morph from cool black to bright red heart, right before your eyes. Made with thermographic inks, this mug reacts to heat. The prefect way to show your love and add some heat to a relationship?! Due to the delicate nature of this heart (and more specifically it's inks, make sure to only handwash it, and not to leave it sitting in water for any lenght of time, as this may damage it, and noone wants a broken heart) What's it made of?Stoneware with thermographic ink How does it come?In a box 10 x 12 x 9 cm approx