Qiyun 100 Man-made Green Glow in the Dark Pebbles Stone for Garden Walkway--Making Your Garden or Yard Looks Different from Your Neighbors' at night 100 piece set of man-made pebbles Line a walkway, edge a flower bed or fill a planter with these unique acrylic pebbles After being exposed to daylight, these pebbles glow (green) in the dark Glow lasts approximately two to three hours after full sun exposure Not toys, keep away from children for chocking hazard!