Keep your dog engaged in fetch with the Chuckit! Sonic Fetch Pack Duo! This fetch pack combines two of Chuckit!'s best-selling fetch balls - the Chuckit! Ultra Squeaker and the Chuckit! Super Crunch Ball - into one excellent package your dog will love! Designed to capture your dog's attention during fetch, the Ultra Squeaker emits a loud squeak, while the Super Crunch Ball features a crackle sound that crinkles and crackles without breaking down with use. Crafted for fetch, both balls are made from safe, durable materials that are gentle on your dog's mouth and compatible with medium Chuckit! Launchers. Enhances fetch time by activating your dog's curiosity.