These attractive 16 ounce pilsners feature our state-of-the-art refreezable crystal technology, with a new flared pilsner design. The color coordinated base combines beautifully with your favorite team colors and graphics. Eliminates the need for ice as the crystal technology keeps drinks cold for hours without the watered down affect of ice! To use, place in freezer for one hour or more, where frozen crystals will turn a frosty white color. Filled with non toxic, refreezable crystals. Not for use with Dishwashers or Microwaves."