Butterflies Mug Pour hot water to see colorful butterflies appear. Cool silhouettes transform into classic naturalist illustrations. Our heat-transforming mug reveals 18 different species (common and Latin names on the bottom). Witness a beautiful metamorphosis every day! Perfect for any hot beverage: coffee, tea, hot chocolate, pumpkin spiced beverage. • 14 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!