Although primarily designed for indoor use, the Illuminarie (Glow in the Dark) Symbol Pot Stickers from Echo Valley are equally at home outside in a potted plant, container garden, fairy garden or hanging basket as garden art. Luminescent crystals inside the 1.5" glass marble absorb light energy during the day and release it at dusk in the form of a soft green glow. Glow duration may last up to 3 - 4 hours, gradually fading over that time. All metal parts in these garden accessories have an electroplated pink finish applied providing protection from the elements. They can also be used as a support for young starter plants and saplings. Set includes four different symbol designs. Love, Peace, Infinity, Trinity Avg. size is 2" x 4.5" x 14"