1. Material: High quality fluorescein 2. Usage Method: Break the fluorescent substance inside, and crush it thoroughly, than flick it with your finger 3. Features: High quality material, light weight and small volume, to lighten the weight of float, increase the sensitivity, and the luminescent time is over 12 hours. 4. Tips: You can keep the broken light stick in refrigerator to reduce rate of reaction and prolong fluorescent lifetime. 5. Package Include: 20 x Light Sticks
