PAURO Women's Silver Plated Hollow Penguin Magical Fairy Glow in The Dark Pendant Necklace Length 20" Chain lengh: 19.6inches(50cm) Made with zinc alloy, finish by silver plated. The glow will gradually fade until recharged. Direct sunlight, or high wattage bulbs are needed to obtain the maximum glow. Handmade by envioremental protective luminous material which was lock, completely free of toxic. Comes in a black free velvet PAURO jewelry bags.