There are uncountable mug factories in China, how to stand out from so many competitors? Is quality, service or price? All wrong! Color changing mug is the best answer. Color changing mugs also called magic mug. It changes color or picture when filled in hot water above 45? or icy water below 17?. Magic mugs are widely used in advertising promotion, valentine gifts, institution souvenir, unique consumer & etc.. So our clients includes companies, online shops, public organization, retail stores & etc.. since 1994, we are also a wholesaler, OEM and ODM are availble.