Safety and environmental protection: made of polystyrene plastic, environmental protection, no radioactivity, non-toxic. Finishing and polishing to ensure there are no sharp edges. Luminous: approx. 200 non-toxic luminous resin pebbles per bag. These pebbles absorb enough sunlight or other artificial light during the day to shine for 3 to 6 hours at night. Ideal decoration: Pebble lighting in the dark is the best decoration at night. The demonic stones glowing in the dark will be brighter with them, special decoration is enough to attract the attention of passers-by. Easy to use: Expose in the sun or strong light for 2-3 hours. Then they will automatically glow in the dark. If you expose them for longer to stronger light, they will shine brighter and last longer. Wide range of uses: indoor and outdoor paved decoration, very suitable for decorating gardens, paths, flower beds, decorative vases, aquariums, aquarium arrangements, water games, swimming pool arrangements, etc. pack: 1x