Echo Valley 42173 Illuminarie Celestial Potstickers, Set of 3 Glows in the dark Decorative metal and glass stake designed for use in a potted plant or container Luminescent crystals inside the 1-1/2-Inch glass marble absorb light energy during the day Releases stored energy at dusk in the form of a subtle green glow Weather resistant electroplated antique copper finish will withstand the elements and provide years of use and enjoyment