Quantity: 100 pieces of light stones, the dimension of each decorative stone is 0.78"-1.18". Safety and environmental friendliness: light pebbles are made from from polystyrene (PS), non-toxic & tasteless, non-radioactive. Glow in the Dark: These pebbles absorb enough sunlight or other artificial light during the day to glow for up to 3-5 hours at night or in any other dark environment.< /p> Multifunctional Shiny Stone: Great for Aquarium Gravel Decorations, Pond Decorations, Yard Decorations, Halloween Outdoor Driveway Decorations, Garden Gravel, Aquarium Gravel, light rocks, etc. NOTICE: 100 pcs Garden Pebbles.