Description Stock cars round the corner as the white flag is waved when the mug changes, the cars roar across the finish line and a checkered flag is waved. Great for all you race fans out there. Wonder mugs are color-changing coffee mugs that change dramatically when a hot beverage is added. If you’re looking for a unique gift for them, what a unique way to remind them of you daily! These unique, high quality gift mugs utilize color-changing or “thermochromatic” ink that changes color when hot beverages are poured into the inside of the mug. Color change gift mugs are ideal for fund raisers, birthday gifts, teacher’s gifts, corporate gifts and more. All Wondermugs are microwavable. We recommend hand wash only to preserve the magic Wondermug ink.
