Chuckit! Whistler Ball Dog Toy, Pack of 2, Multicolor, Medium (2.5 Inch Diameter) for Dogs 20-60 lbsWhistles When Launched: This 2. 5" dog ball is designed with four sound holes that create a whistling sound, making fetch more exciting for dogs. Recommend using any size Medium Chuckit launcher; casually tossing The Whistler will not yield loud whistles Super High Bounce: This Chuckit ball for dogs is made of durable rubber yielding an ultra bouncy, exciting fetch experience. Not designed to float, land use only; not a chew toy, always supervise your