GlowKnights Glow In The Dark Shot Glasses - 6 Per Pack - Glows for 8 - 12 Hours. 6 BRIGHT COLORS - Yellow, Pink, Green, Red, Orange and Blue Each Cup Will GLOW FOR 8 - 12 Hours Once Activated These Shot Glasses Are IDEAL FOR ANY PARTY. Their Bright Glow is Perfect For Halloween or Any Other Special Event NO BATTERIES NEEDED, These are Glow Shot Glasses And Use The Same Technology as Glow Sticks. So these Glasses Will Never Let You Down STRONG AND DURABLE, these shot glasses are incredibly robust due to their strong design so you never have to worry about breaking a cup