onegood 100 Man-made Glow in the Dark Pebbles Stone for Garden Walkway (Green) Material: Photoluminescent pigment + resin Line a walkway, edge a flower bed or fill a planter with these unique acrylic pebbles 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! 100 Man-made Glow in the Dark Pebbles Stone