KONG Cat Wubba is specifically developed to appeal to a cat's instinctive desire to stalk and capture prey. All Cat Wubba toys have a rattle sound and are Infused with KONG's premium North American catnip for added attraction. The unique tails make a crackle sound that rewards contact and encourages continued play. Cat Wubba toys stimulate senses of sight, sound, smell and touch. Covered by KONG Satisfaction Guarantee. See KONG Satisfaction Guarantee document below for full details.