Seas & Mountains: Simple Sunset Mug - Sunset Series. Unique design that is minimal and simplistic!The heat-reactive surface reveals the 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. 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 interiorLead and BPA-freeHeat-reactive designGlossy finishNB! Hand wash recommended