XIUH 20 Glow in Dark Pebbles Stone Home Garden Walkway Aquarium Fish Tank Valentine Features: Brand new and high quality Pebbles areabout the size of cooked lima beans Line a walkway, edge a flower bed or fill a planter with these unique Stone pebbles After being exposed to daylight 5 minutes, these pebbles glow in the dark Glow lasts approximately two to three hours after full sun exposure Per Stone Size:1inch x 0.5 inch Color:As the picture shows Attention: Please expose the stone to daylight at least 4 hours Before first use Package Included: 20 Pcs Glow in The Dark Pebbles Material: PVC Include: 1X20pcs luminous stone Size: 3.93 inch x 3.93 inch x 0.39 Occasion:Home,Kitchen and Other. Service: Hello customer, if you have any questions, please feel free to contact us and we will reply to you within 48 hours.