These flexible silicone armbands clearly and quickly identify friend and foe in glow-in-the-dark games and activities. Charge them under any light source for up to 60 minutes of team-based fun in the dark. Worn on players' forearms, they're quick and easy to put on before the game begins. They're also the friendlier option to share among classmates! Small is 2.6" dia and large is 3.5" dia. Available in sets of 6.