Our Tyvek® 3/4" Glow Under Black Light wristbands are the coolest product out there! Does your event or venue use UV black lights? Have your guests go "WOW" when they see the fluorescent glow from their wristbands when they're under a black (UV) light! Each Tyvek® Glow Under Black Light wristbands comes sequentially numbered for easy audit control and revenue tracking purposes. Please note- These bands will NOT GLOW in a darkened area…will only work with a (UV) black light, they have a coat of “optical brightener” which appear to "glow" when a UV black light is present.