Petlinks Fly Wild allows for a wonderful pet and pet parent bonding experience. You and your cat will have endless fun as you dangle, glide and send the extra plush tail soaring through the air with kitty closely pursuing. Added benefits include rope, ribbons, feathers and HappyNip which is an exciting blend of silvervine and catnip. Silvervine, a wild-growing herb foraged in the mountains of Japan and China, has a strong natural effect on cats, even some that don't respond to catnip. After extensive testing to find the perfect blend.