Material: Made of high quality resin, non-toxic and odorless, free from radioactive substances. Fluorescent glow effect. Environmentally friendly and energy saving: no electricity required, economical and energy efficient. It can absorb and store energy from the sun or other light sources to illuminate dark places. Great Decorative Effect: These shiny stones are ideal as aquarium gravel or for decorative pots, aquarium landscaping, horticulture, swimming pools, bars and parks. ENVIRONMENTALLY FRIENDLY and REUSABLE: Shiny stones can be used repeatedly. Their life expectancy can reach 15 years. Reusable: Remove the packaging and put the pebbles in the sun or light. Make sure that each pebble absorbs the light. It can be reused.