Safety and environmental protection: made of polystyrene plastic, environmental protection, no radioactivity, non-toxic. Finished and polished to ensure there are no sharp edges. Luminous: approximately 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: Pebble lighting in the dark is the best night decoration. The glowing demon stones in the dark will be brighter with them. Special decoration is enough to attract the attention of passers-by. Easy to use: Expose to sunlight or strong light for 2-3 hours. Then they will automatically glow in the dark. If you expose them to stronger light for longer, they will shine brighter and last longer. Wide range of uses: indoor and outdoor paving stone decoration, very suitable for decorating gardens, driveways, flower beds, decorative vases, aquariums, aquarium arrangements, water features, swimming pool arrangements, etc. pack: 1x luminous pebbles (200 pieces, mixed colors ) Please keep out of reach of children under three years old to avoid suffocation. 1. Manual measurement, there will be errors in size, please refer to the actual size 2. Due to the difference in light and screen, the color of the product may be slightly different from the picture.