Green Stuff World Mixed Aqua Turquoise Glow Translucent Crystals - Small Decorate bases, dioramas, and terrain pieces with these amazing resin crystals. Make them look unique, personalized, and stand out. This set includes medium crystals of various shapes and sizes. The crystals can be single or multiple. To activate glowing properties, the crystals must absorb ultraviolet light beforehand, either from natural light or from ultraviolet torches (UV Flashlight) Crystal widths: 2mm - 8mm, lengths: 6mm - 12mm. Contains 100-105 crystals.