This color morphing mug hides a message for mom-"I love you, Mom. You're the best!"-that the heat-reactive surface reveals once the mug gets warm. This mug will be the gift that keeps on giving. The  The 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) – plenty for that big morning cup of coffee. Lead and BPA-free. Hand wash recommended.