The Longhorn freezer mug keeps beverages and crushed ice cold for hours without the watered down effect. The drink will hold it's true taste from the first to the last drop. Place the freezer mug in the freezer for one hour or until frozen. When frozen the crystal will turn a frosty white color. Remove the mug and fill with your favorite beverage for instant coldness. Do not use in microwaves or dishwashers. The mug is filled with non toxic refreezable crystals.