Add a pleasant twist to your morning routine with this glossy magic mug. It appears black when cold, but reveals a vibrant print when exposed to hot liquids. That makes this mug a wonderful gift for your family or friends. • Ceramic • Dimensions: 3.54″ (8.9 cm) in height, 3.35″ (8.5 cm) in diameter • Black glossy 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 cases the coating might not be 100% opaque and the outline of your design might peek through a little.