Color changing boob design mug.The heat-reactive surface reveals the boob design 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. 11oz .: One size: 11oz (0.33 l) .: Ceramic material with black exterior and white interior .: Lead and BPA-free .: Heat-reactive design .: Glossy finish .: Hand wash recommended