E-Tribe Man-made Glow in the Dark Pebbles Stone for Garden Walkway Sky Blue--Making Your Garden or Yard Looks Different from Your Neighbors' at night (Green) 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 in the dark Glow lasts approximately two to three hours after full sun exposure Not toys, keep away from children for chocking hazard!