Features: After the luminous sand is illuminated by sunlight, natural light or light, it can self-illuminate and repeat indefinitely. Harmless, non-radiation, safe for skin, strong adsorption capacity for environmental protections. It can still be bright during the day, but it must be in a dark place, and the luminous sand can also show its luminous effect in an environment with few light sources. Of course, the darker the effect, the better! Just let them absorb the lights source (sunlight, fluorescent lamps, outdoor natural light), but the environment must have a contrast between light and dark! ! The luminous effect is short-lived, not long-term, but it can be repeatedly absorbed and brightened. Of course, the longer the lights is absorbed, the longer the night lights will last. Non-flammable and non-volatile. Specifications: Color:9 Color Material: Luminous Sand Size:As Picture Shows Quantity:1 Bag Package Includes: 1 Bagx Luminous Sand note: Please allow a little error on the size due to manual measurement. The color might exist slightly difference due to different displays.