The Star Trek Warp Speed heat-transforming mug takes you from cruising altitude to deep space when you add hot water. Sip a cold drink and admire the legendary words TO BOLDLY GO and pour in hot liquid and the image of the Enterprise disappears 12 oz Perfect for any hot beverage: coffee, tea, hot chocolate, pumpkin spiced beverage. • 12 oz. Ceramic coffee cup with a comfortable handle. • All of our 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! Timeless Keepsakes~ Trendy Kitsch~ We Have It All