Chuckit! Squeaker Tennis Ball Dog Toy: These are our classic tennis balls with a twist, now with an exciting squeak! This squeaker tennis ball is designed with a built-in squeaker that creates fun sounds during fetch. Crafted with high-quality materials, these balls are specifically weighted for optimal fetch play. Compatible with Chuckit! Launchers for extended fetch fun! Run further, fetch longer: Made for Chuckit! Dog Ball Launchers for extended throws, these squeaker tennis balls create an exciting game of fetch for you and your dog. More exciting than standard tennis balls, these will excite any fetch experience. Durable Design: These dog toy fetch balls are designed with a thick rubber core, natural rubber and durable material that can stand up to extended rounds of fetch yet is soft on dog’s mouths. These squeaker tennis balls also float in water! Not intended as a pure chew toy, always supervise your dog when playing with any toy. Sizing matters: Size large measures 3" in diameter and is best suited for dogs weighing 60-100 lbs. The ball should be small enough for your dog to carry, but large enough that the ball can't completely fit in their mouth. When in doubt, buy a size up!