Our Sun Jeweled Fun Penguin Ring is a unique way for kids and even adults to show their penguin passion. The adorable 1/2" tall, sparking penguin changes color in the sunlight. Indoors and at night the penguin is lightens up,but in the sunlight the color gets darker and more vibrant. The brighter the sunlight the darker the color. The adjustable / one size fits all ring is made of a base metal (nickel), and fit most kids ages 4 and up and adults up to a ring size 7. U.S. tested safe.