Freezer Mug - Double Wall -16oz. Capacity - Clear These Decorative Mugs are great for the daily use of all your cold beverage needs. BPA Free Acrylic Double Wall Construction, filled with Non Toxic Refreesable Crystals. Eleminate the need for ice keeping your cold drink while not diluting or watering it down. Simply place in the Freezer for 1-2 Hours before use, and watch as the crystals freeze, readying themselves for you to pour your drink and enjoy. Hand wash Not recommended for Diswhasher or Microwave use.