Telling someone you love them is not always easy, so this Love Hearts Heat Change Mug may just offer a solution. This standard sized mug features two large red hearts when the mug is cold. As soon as the mug is filled with a hot beverage, the hearts disappear to reveal the message 'I Love You'. The Love Hearts Heat Change Mug is officially licensed by Swizzels Matlow, makers of the legendary Love Hearts sweets. It should not be placed in a dishwasher or microwave in order to protect its heat change properties. Made of stoneware, it has a capacity of 300 ml.