Put the pebbles under light when you receive it, pebbles can glow if you put it in dark. These glow pebbles absorb and store energy from sunlight or other light sources and light up in dark environments. visual appeal and give a good mood for you. When you are anxious, it will be a pleasing good to release stress. Features - ColorAssorted Color - Material: Luminous powder, polystyrene resin. - Size: 3x3x0.5cm / 1.18x1.18x0.2inch. - Use it for decorative vases, fish tanks, aquarium landscaping, gardening decoration, swimming pool decoration; villa gardening potting, parks and so on. - You just pave them along the pathway and these pebbles will flash a brilliant glow after absorb enough sunlight or other artificial light during. - There is no because of fine workmanship and polish. - The pebbles in the absorption of sunlight or light exposure, and they will glows for up to 2-3 hours or more in the dark environment. - Each pack comes in different color mixed, enrich your decoration. Package list: 2 packs x luminous stones