Fredhome 100 Pcs Glow in the Dark Sky Blue Noctilucent Pebbles Stones for Walkway Park Garden Ornaments--Making Your Garden or Yard Looks Different from Your Neighbors' at night Material: Photoluminescent pigment + Resin After being exposed to daylight, these pebbles glow (yellow green)in the dark Glow lasts approximately two to three hours after full sun exposure warning! Not toy, keep away from children for chocking hazard Perfect for Line a walkway, edge a flower bed or fill a planter , Fish Tanks, Pools, & Ponds. Can also be used for Gardens and Home Plant pots