Description: Fish Tank Landscape Glow Stones Aquarium Luminous Stone Decorate Fish Turtle Tank Corful landscape glow stones have ornamental value Landscpe glow stones give out dazzling light, fishes can swim freedomly Work with waving pump, your fishes will swim dynamically If the landscape glow stones were put in the sun, the glowing effection will be better. when you receive the products, you shoud use flashlight to shine them for 5-10 minutes, then you can observe the effect of the landscape glow stones, when you put them in the dark. Specification: Material: Environmental friendly Silica gel Weight: 200g (a packet of landscape glow stones, 10 pieces /packet) Color : Randomly shipping Size: About 2-5cm / 0.78-1.96inch Package Includes: 1 X A Packet Of Landscape Glow Stones( 10 Pieces /Packet )