When the mug is cold, RBG wears her judicial robe. When the mug is hot, hand Justice Ginsburg a boxing robe. Our Ruth Bader Ginsburg Transforming Mug reminds you to stay strong-and, as U.S. Supreme Court Associate Justice Ginsburg said: "play your part in helping to achieve a more perfect union." • 12 oz. Ceramic coffee cup with a comfortable handle. • All of our disappearing mugs come in a beautifully designed, colorful box. • Heat activated color changing mugs are microwave safe, but not dishwasher safe. Hand wash only. Don't soak. • UPG is a novelty gift company specializing in smart and funny gifts. Check out our shop for all types of quirky fun stuff!