ChemLights aren't some child's toy you find at a party store. When the Navy has a man overboard, they reach for a ChemLight to mark his location. When a downed Air Force pilot needs to mark his position for extraction, it's ChemLight he trusts. These yellow tactical light sticks provide bright, reliable, 360-degree illumination for up to 12 hours. The yellow ChemLight is so bright it can be seen from up to a mile away - so you'll have no problem illuminating common areas, work areas and camps 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 ChemLight in place whether you're hanging, attaching or stringing them together. To activate ChemLight, simply bend, snap and shake to immediately flood your surrounding area with bright light. Each yellow ChemLight measures 6'' long, 10 sticks per pack. For added convenience, each light stick is individually foil-wrapped for protection from light and moisture and boasts a four-year shelf life from date of manufacture. 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.