Three hours: Pebbles will glow for up to three hours after normal daylight exposure. Six colours: Choose from cyan and green, grey and blue, red, blue, green or assorted. Glow in the dark: Absorbs sunlight during the day in order to glow in the dark. Perfect for the garden: Ideal for decorating your plant pots, pathways or rockeries. Eco friendly:Approximately one inch long and made from eco-friendly plastic. Garden pebbles: Get a pack of garden pebbles. | Glow in the Dark Pebbles | Wowcher