This is the Hottest Lightup Novelty on the market right now. Just ask any kid. They are made of soft non-toxic rubber and resemble a retainer or sports mouth guard. They have four super bright LED lights - Yellow - Red - Blue - Orange. When you press the button with your tongue, the LED lights flash on and off in sync to produce a great light show. Kids love them. Great for parties or rewards. Great for night clubs, dances, weddings, raves, and concerts.