Reusable glow stick. This STICK solidifies particles with epoxy resin, absorbing light and glowing for up to 12 hours. While GLOW STICKS used at live events are disposable, this one can be used semi-permanently as long as there is light, and it shines very brightly. Perfect for everyday use! Dustproof and waterproof. Available in two sizes: 3 inches and 6 inches. Can be used as a keychain for various activities such as walks, running, cycling, mountain climbing, camping, diving, and in case of emergencies... etc. Made in: USA Size: H75 x φ16mm Material: Plastic