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'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. includes: A Packet Rocks "