Natural Luminous Ishihara Specimens Of Mineral Crystal Luminous Ball Fluorescente

Product material : Stone /Luminous Resin
Size : 50 mm
package : 1pcs/bag
weight : 173 g

Let them absorb enough light, put them in the sunlight,you also can use the flashlight or the light of the mobile phone screen , and then in the darkness of the environment, they will glow for several hours. They can always repeated to use.