You think regular beer pong is fun, now try it in the dark! The cups and balls just need a quick exposure to light and they are ready to go. For a continuous glow, the beer pong balls and cups glow brightly under the exposure of a UV blacklight. This set includes 24 16 oz. cups and 3 beer pong balls that glow in the dark. We also have 6-packs of extra glow in the dark beer pong balls to keep the party going all night!