This cup is made of BPA-free polypropylene plastic, non-toxic, eco-friendly and safe for use. It's sure to put the recipient in a fantastic mood seeing the mood cups change color as they hold their drinks. Each colorful plastic cup's exterior changes shades depending on the temperature of the liquid inside. Pour a cold or heat drink into these magic mood cups and watch them change color. You can customize the plastic stadium cup in temperature sensitive to heat or cold and the before and after colors. Great for all occasions including but not limited to concerts, parties, weddings, bridal showers, engagement, camping, outdoors, festivals, fundraisers, team spirit events, sports events and more!