A pack of five glow in the dark balloons which are fantastic for parties & celebrations. Clear latex features glow in the dark stars to make a spectacular party balloon that's designed for use with helium or air. These glow in the dark balloons are 100% natural latex which is biodegradable & will decompose quickly. 5 glow in the dark balloon pack 11" diameter 100% natural latex More effective under UV or blacklight * Note: Not Suitable for children under 36 months, may pose a choking hazard For best glow in the dark effects Glow in the dark star balloons feature glow crystals that absorb & store the energy from natural or artificial light. After exposure, the crystals release the absorbed energy as visible light, or glow in the dark. The glow crystals are best activated by contact with UV rays such as black light, fluorescent lighting & natural sunlight although the strength of the visibility will depend upon key variables such as the type of light used, the intensity of light, the distance of the light source from the balloon & the amount of ambient light in the room. Typical charging times Outdoors: 1 minute Incandescent & fluorescent light (white or black light): 5 to 10 minutes Camera flash (close to balloons): Instantly The glow will appear stronger in a dark room once your eyes have adjusted to the lack of light; the strength of the glow is also proportional to the amount of ambient light in the room, the less ambient light, the stronger the glow will appear. To achieve the best glow, expose the balloons to the brightest UV light source that you have. Direct sunlight works better than artificial light. A UV blacklight source will keep the glow star balloons charged at all times & will achieve the brightest possible glow in a darkened room with minimal ambient light. Glow star balloons can be charged again & again for glow in the dark effects.