6 inch Glow Sticks have remained one of the hottest products on the light-up market for years and they're still going strong! Glow sticks contain a non-toxic, glow-in-the-dark chemical that illuminates once activated. To activate, simply bend the stick until you hear it crack. This will release the chemical within the glow stick and it will immediately start to GLOW! They will last approximately 6 - 8 hours once activated. These can be used for Safety Purposes, Parties, Favors, Raves, and so much more!