This beautiful mug changes color. Imagine the surprise on her face when she reads the hidden messages! Nothing says 'I love you' quite the same as this transformational mug. The heat-reactive surface reveals the designs once the mug gets warm. Why she'll get her household chores done in half the time! This ceramic cup will go back to its original black outside and white inside when it cools down. The C-shaped handle helps keep a sturdy grip. It comes in one size, 11oz (0.33l) which is plenty for that big morning cup of coffee... or tea!