4" Mini Glow Sticks come perfectly sized for traveling. Perfect to use for events such as: Festivals Birthdays Fundraisers Christmas St Patrick's Day To activate your Green Mini Glow Sticks, bend the tube until you hear it crack. Sticks contain a non-toxic, glow-in-the-dark chemical that illuminates once activated. Shake well to fully release all the glow throughout the piece. Mini Glow Sticks are sold in packs of 50 and each comes with a string necklace.