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Who doesn't love a good surprise? With this color changing coffee mug, you're definitely in for a great one. This mug has a black matte finish when it's empty. But when it comes into contact with a hot beverage, the mug reveals a beautiful print that'll always make you smile when having your drink of choice. • Ceramic • Height: 3.85″ (9.8 cm) • Diameter: 3.35″ (8.5 cm) • Black matte finish when cold • Reveals the print when exposed to hot liquids • NOT dishwasher or microwave safe • Blank product sourced from China Note that in some instances the coating might not be 100% opaque and an outline of the design might peek through a little. Also, you shouldn't put the mugs in a microwave or dishwasher since it can damage the coating.