KONG Wubba for Cats are filled with premium catnip and have extra-long crinkle tails and rattle to encourage active play. The unique tails make a crackle" sound that rewards contact and encourages continued play. KONG CAT WUBBA is specifically developed to appeal to a cat"s instinctive desire to stalk and capture prey. Promotes realistic wrestling and the longer tails are perfect targets for hind paw kicking."