Made of resin, these glow in the dark pebbles are , odorless, and no substance. There is no power or battery required for these solar luminous rocks glow stones. All they need is just sunlight to absorb enough before they can shine in the dark. Can be used to decorate potted plants, fish tanks, swimming pools and gardening, etc. With our glow in the dark pebbles, you can release your imagination, you can make a gorgeous fairy fish tank or garden. Features - ColorAssorted Color - Material : Resin. - Size: About 3 x 3 x 0.5cm. - Glow in the Dark: Put under light when you receive it, about 20 minutes later, pebbles can glow if you put it in dark. - 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. - 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. Package list: 70 x Glow in the Dark Pebbles Colorful Aquarium Decorative Rocks Luminous Gravels for Garden Yard Fish Tank Fish Bowl Vase Handmade Crafts Decoration