The Cyalume ChemLight is the best chemical light stick you can buy. These military light sticks aren't some child's toy you find at a party store. 4 Inch ChemLights provide bright, reliable, 360-degree illumination for up to 6 hours. The green ChemLight is so bright it can be seen from up to a mile away - so you'll have no problem illuminating small rooms, passages, trails and maps with just a single light stick. ChemLight is waterproof, non-toxic and non-flammable. The light stick has a hook and gate top which keeps the light source secure whether you're hanging, attaching or stringing them together. To activate ChemLight, simply bend, snap and shake to immediately flood your surrounding area with functional light. Each light stick is individually foil-wrapped for protection from light and moisture. ChemLight meets Defense Logistics Agency (DLA) and NATO Maintenance and Supply Agency (NAMSA) specifications. National/NATO Stock Numbers (NSN) are printed on each product for reference.