Glow in The Dark Rocks Sea Shells Starfish Pebbles Stones,90pcs Colorful Glow in The Dark Pebble Glowing Conch Shell for Outdoor, Walkway, Window, Yard Grass, and Fish Tank Decoration Glow in the Dark Rocks Pebbles Stones These luminous conch shells are made of photoluminescent pigment and resin,they are safe for the fish and water. These colorful stones could glow in the dark for a period of time after absorbing the sunlight for 10 ~ 20 min. They are suitable for aquarium decoration, fish tanks, pools & ponds. They can also be used for gardens and home plant pots. Please note they are not toys, keep away from children for chocking hazard!These pictures are taken under the irradiation of blue & white lights, we recommend blue & white light, blue light or purple light to get better effect. There are 90 pcs glow in the dark rocks pebbles stones and conch shells in each package,and we will send them at random style.