View larger Pittsburgh Steelers Crystal Freezer Mug The latest, greatest, and coldest! This handsome 16-ounce mug combines state-of-the-art refreezability with color coordinated handle and base, and features your favorite team colors and graphics. It eliminates the need for ice as the crystal technology keeps drinks cold for hours, without the watered down effect of ice. To use, place the mug in your freezer for one hour or more, allowing the frozen crystals to turn a frosty white color. This product is filled with non toxic, refreezable crystals.