It also generates air currents to stimulate the euphoric aroma from catnip inserted into the center. ?This toy just might end a cat?s boredom forever! Watch your cat go wild with the Catnip Hurricane from Bergan Place catnip in the center of the toy and give the 2 balls a whirl - the balls' rotation circulates the catnip's captivating aroma into the air Comes with catnip and 2 small balls