Cyalume SnapLight Blue Light Sticks &ndash; 6 Inch Industrial Grade, High Intensity Glow Sticks with 8 Hour Duration (Pack of 500) MADE IN THE USA UNDER STRICT QUALITY GUIDELINES to ensure each light stick works without issue - guaranteed. Rest assured knowing you can trust SnapLight PATENTED, LONG-LASTING FORMULATIONS provide high light output for 8 hours at a time to help you get the job done when electric light isnt an option. GUARANTEED 5 YEAR SHELF LIFE AND INDIVIDUAL FOIL WRAPPING means SnapLight can be safely stored for years until the need arises without harm to the stick or components. INDUSTRIAL-GRADE STICK CONSTRUCTION protects internal components during use, providing a level of durability not found in competitor light sticks. WATER-PROOF, NON-FLAMMABLE, NON-TOXIC CHEMISTRY means SnapLight is as safe as it is durable. Perfect for confined spaces or underwater applications.