Features: Glow in the Dark Rocks: These glowing rocks absorb and store energy from sunlight and other light sources,light up in dark environments. These glowing pebbles can glow for up to 3 to 5 hours in darkness after a full day in the sun. Material: Luminous stone is an artificial stone made of high-quality plastic, non-toxic, tasteless, safe and durable. The pebbles are very small, please play under the supervision of adults to prevent children from swallowing them by mistake. Multifunctional Glowing Stone: Ideal for fish tank gravel decorations, pond decorations, yard decorations, Halloween garden walkways Dcor, outdoor driveway decorations, yard gravel, aquarium gravel, luminous rocks, etc. How to Use: Put these decor stones under the sun, so that they can absorb enough light for at least 1 hour, and then can spread anywhere you like, these stones will glow for 3 to5 hours in the dark, if it& 39;s not bright enough, please illuminate them with light again. DIY Gift: These Glow in the dark gravel can bring effects, Glow in the dark gravel can be used for art & crafting, DIY gift decorations,You can send it as a gift to your families, friends and colleagues. Specification: Material: Plastic Size: 2-3cm/4-5cm Color: Muticolor Notes:Please allow slight tolerances in size due to manual measurement, and lighting in photography may result in a difference in color than in real. A Packet Rocks