🌍 Heat-activated color change – Watch the world map and airplane routes appear as you fill the mug with a hot drink. Dishwasher Safe! - Easy clean and dishwasher safe. Colour-changing mug for travelers. Sip on something mysterious with our heat-changing travel mug. Once the heat from your beverage hits this temperature-sensitive magic mug, the black paint fades to reveal your favorite photos beneath! Brew up a cup for yourself, or gift it to loved ones. 11oz ceramic coffee mug with a matt finish When filled with a hot drink the heat sensitive mug's black surface fades to reveal images Microwave and dishwasher-safe coffee mug We recommend you wash the mug with a mild detergent and with no bleach to keep your photo(s) bright Available for Collect in Store - note that the print area has a 7mm gap at the top and bottom of the mug Measures 3.75” (9.4cm) tall.