Eco-Friendly Material: The Glow Pebbles Are Made Of Polystyrene (Ps), Non-Toxic And Tasteless, Non-Radioactive. . Versatility And Year-Round Decoration: Whatever You Want To Add Color To Your Garden Bed This Spring, Decorate The Fairy World Terrace During The Christmas Holidays, Or Give Your Fin Friends A Unique Environment, These Glow Stones Are The Best Choice For You. Ideal For Waterscape, Landscape, Potted Plant. Illuminating A Path, Driveway, Flower Bed, Aquarium Or Garden. . Environmentally Friendly And Energy-Saving: These Stones Cannot Grow By Themselves. But After Exposure To Daylight, These Stones Glow Beautifully In The Dark. The Glow Lasts Approximately Two To Three Hours After Full Exposure To The Sun. No Electricity Is Required And Pebbles Can Be Exposed Outdoors For Years. . Easy To Use: Let The Pebbles Absorb Enough Sunlight Or Artificial Light For At Least 4 Hours And Pave Them Along The Path. They Shine Brightly At Night And Transform Your Garden Into A Beautiful And Dreamy Landscape. .