Resin, these glow in the dark pebbles are odorless and contain no radioactive substances. No power or battery is required for these environmentally friendly solar luminous rocks. All they need is sunlight to absorb ultraviolet light before they can shine in the dark. They can be used to decorate potted plants, fish tanks, swimming pools, and gardens. With our glow in the dark pebbles, you can create a beautiful illuminated fish tank or garden. Features - Color: As shown - Material: Resin - Size: Approximately 2 x 2 x 2 cm - Glow in the Dark: Place the pebbles under light after receiving them; they will glow when placed in the dark - Eco-friendly Material: Made of resin, safe and non-toxic - Unique Shape: Each stone has a different shape, ideal for decorative purposes - Mixed Colors: Each pack contains a variety of colors to enhance your decor - Suitable for fish tanks, ponds, yards, water features, landscaping, potted plants, pathways, driveways, fairy gardens, crafts, and more - No electricity needed: These glow pebbles absorb and store energy from sunlight or other light sources and emit light in dark environments