Safety and environmental protection: Made of polystyrene plastic, environmental protection, no radioactivity, non-toxic. Finishing and polishing to ensure that there are no sharp edges. Luminous: About 200 non-toxic luminous resin pebbles per bag. These pebbles absorb enough sunlight or other artificial light during the day to glow for 3-6 hours at night. Ideal decoration: Lighting pebbles in the dark is the best night decoration. The glowing demon stones in the dark will be brighter with them. A special decoration is enough to attract the attention of passers-by. Easy to use: Expose to the sun or strong light for 2-3 hours. Then they will automatically glow in the dark. If you expose them to stronger light for a longer time, they will glow brighter and last longer. Wide range of uses: indoor and outdoor cobblestone decoration, very suitable for decorating gardens, walkways, flower beds, decorative vases, fish tanks, aquarium landscaping, water features, swimming pool landscaping,