NCAA Purdue Boilermakers 16oz Crystal Freezer Pilsner 16 ounce crystal freezer pilsner with team color base Uses patented non-toxic refreezable crystal gel Place in freezer for 30 minutes to an hour Freezer gel keeps drinks cold without needing ice. No more diluted drinks! BPA free, lead free, safe to use Officially licensed NCAA merchandise 16-oz freezabe mug The crystal technology keeps drinks cold for hours without the watered-down affect of ice Place in freezer for one hour or more Not for use with dishwashers or microwaves