TR318 Glow in the Dark Garden Pebbles for Walkways and DIY Decorative Gravel Stones Brand 100 Pcs Material: Photoluminescent pigment + resin Pkg include:100 Man-made Glow in the Dark Pebbles Stone with a stylus After being exposed to daylight, these pebbles glow in the dark Line a walkway, edge a flower bed or fill a planter with these unique acrylic pebbles Glow lasts approximately two to three hours after full sun exposure warning! Not toy, keep away from children for chocking hazard