Custom Cute Grumpy Cat Morphing Mugs Coffee Tea Cup 11 Ounce 11 Ounce High Quality Ceramic Mug With Print On Both Sides Perfect For All Your Favorite Hot & Cold Beverages Work with coffee,tea,milk at office or party,coffee house,house home. More healthy than plastic cup plain black in color when it's cold,turn white and reveal your design only when filled with a hot beverage