100 Pcs Man-made Artificial Unique Luminous Glow in the Dark Pebbles Cobblestone Stone for Garden Walkway Yard Planer Aquarium Fish Tank Gravel Decorations - Jacinth Made of luminescent pigment and resin, not the natural stone Line a walkway, edge a flower bed or fill a planter and fish tank with these unique acrylic pebbles After being exposed to daylight, these pebbles glow in the dark; Glow lasts approximately two to three hours after full sun exposure Package included: Man-made Stones x 100; Note: Not toy, please keep away from children for choking hazard; Remark: Please expose the stones to the sun in the daytime to absorb enough light, so that they can glow in the night better; Free touch screen stylus pen is included (Random color shipped)