Features: Non-toxic, odorless, and non-radioactive, safe for fish, birds, and plants, can glow under the dark place. stones pebbles idea for aquarium decorations for fish tank, mason jar, pathway, yard garden decoration aquarium decoration. Pebble lighting source are from solar, requires no electricity and no power, environmental-friendly. Glow Stones pebbles absorb sunlight during the day and give off light throughout the night. Intensity is strongest 2 - 3 hours at night after a full day in the sun. DIY project: The great quantity is enough for you to pose different patterns, shape on the place you want, more a game for creativity. Gorgeous stones with an elegant surface: Smooth, polished, and easy to clean.