With 360 degrees of fun that'll bring out the kitten in any cat the FAT CAT® Crazy Circle® is a tubular plastic track that holds a removable, reloadable catnip ball. Your cat will poke at and chase through paw-sized openings that are perfect for swatting. This fun cat toy will drive cats crazy as they bat the ball around the circle trying to get it out. Great exercise toy and boredom buster. Made of durable, long-lasting, easy-to-clean plastic. No batteries required, cat powered.