These 10mm round luminous bracelets are elastic to fit most wrist sizes and glow in the dark when exposed to light. Luminous Stone is a type of artificial stone. It absorbs light and emits light in a dark place. The light weakens over time, but it can be used repeatedly. Due to this nature, it is used as an amulet that gives "brightness" and "hope". As it carrys the light of hope, it helps eliminate fear and anxiety.