HEMPER Tornado Vortex Bong BoxDescription Now available as a FULL one off set, the July HEMPER box! This box featured the first ever HEMPER Tornado rig with Vortex smoke cooling technology. Those 3 holes in the top of the piece? These airflow slits are what create that tornado effect as you take your hit! The extra air allows the smoke to swirl into a vortex, providing extra cooling time to deliver the smoothest possible hit! Not only does the Tornado rig provide excellent smoke