Never run out of ammo in a firefight! Use this pack of 10 Nerf Vortex glow in the dark discs to keep you in the game. These white discs work with the Firefly Tech magazine (sold separately) so that they glow in the dark as you shoot them out of your gun. This helps you to correct your aim if you miss your opponent the first time round. These discs will give you the edge in any night battle.