[Safe and durable]: The light in the dark is made of natural resin, and the luminous stone is artificial rock, non-radiation, and non-odor. Rocks that glow in the dark are harmless to people and can be very safe for children to play. Glowing are harmless to fish [Various uses]: The luminous stone can be used for garden decoration, backyard walkway, path or driveway, garden exterior decoration, lawn, fish tank, outdoor pavilion, swimming pool, pond, bar indoor and outdoor cemetery decoration. Luminous gravel can be used for arts and crafts, DIY gift decoration [How to use]: Let the luminous stone absorb enough sunlight or artificial light for at least 1 hour, and lay it wherever you like. Glowing emit a shining light in the dark environment, making your , garden, fish tank, and park look beautiful. Stone decoration that glows in the dark, suitable for walkway, , garden decoration, absolutely gorgeous [Warning Tips]: Rocks that glow in the dark need to expand the growth rocks when charging to that the growth rocks get the maximum light exposure. The luminous are very small and need to be played under adult supervision to prevent children (children under 6 years old) from swallowing. Colour: Blue Material: resin Size: 2-3CM Package Contents: 500 x luminous stone Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.