Nightmare on Elm Street Morphing 11 Oz. Mug is available for purchase now. Personalized mugs are super popular gifts for friends and loved ones. This one change color and will be the gift that keeps on giving. The heat-reactive surface reveals your custom designs once the mug gets warm. 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. .: One size: 11oz (0.33 l) .: Ceramic material with black exterior and white interior .: Lead and BPA-free .: Heat-reactive design .: Glossy finish .: NB! Hand wash recommended