Non-toxic and do not contain any radioactive elements..Glow stones absorb and store light and then when in darkness they give off light..In darkness, they glow and help to show walkway, path, driveway, floor, or decorate garden, aquarium, fish tank, plant pots, bonsai..The darker the surrounding and the more exposure to visible light, the more bright glow can be seen..Package included: 100 Pcs Fish Tank Rocks
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