Description Made of high quality resin, these glow in the dark pebbles are non-toxic, odorless, and no radioactive substance. There is no power or battery required for these environmentally friendly solar luminous rocks glow stones. All they need is just sunlight to absorb enough ultraviolet light before they can shine in the dark. Can be used to decorate potted plants, fish tanks, swimming pools and gardening, etc. With our glowinthe dark pebbles, you can release your imagination, youcanmakeagorgeousfairy fish tank or garden. Features - Color: As shown. - Material : Resin. - Size: About 5x 2 x 2cm. - Glow in the Dark: Put the pebbles under light when you receive it, about 20 minutes later, pebbles can glow if you put it in dark. - Eco-friendly Material: Resin material, no harm. - Unique Shape: All stones come into different shape, like conch shell, very funny for decoration. - Mixed Color: Each pack comes in different color mixed, enrich your decoration. - Perfect Glow Stones: Valentines Day Home Decoration , Line a walkway, a flower bed or fill a planter with these glowing stones that will glow in the dark after being exposed to daylight. - for fish tanks rocks pebbles gravel, glow decor, ponds, yard, waterscapes, landscape decoration, potted plants, lighting a pathway or driveway, fairy garden glowing stones, crafts, etc. - No electricity needed These glow pebbles absorb and store energy from sunlight or other light sources and light up in dark environments. - Warm Tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you