Boundr(TM) has a squishy, hollow core-perfect for endless fetch sessions. A safer, more durable alternative to tennis balls. Features Safer, tougher alternative to tennis balls Hollow, squishy feel is satisfying to chew, fetch, and carry Fits in standard ball thrower & Floats in Water Non-toxic & Dishwasher Safe Available in a Glow-in-the-Dark option Made with zero-waste and recyclable Zogoflex(R) material in Bozeman, Montana Specs Small Two-Pack 2.5" Additional Details: PLAY SAFE. PLAY SMART. Please remember your dog's safety is your responsibility. No dog toy is indestructible. Choose only toys that are the appropriate shape and size for your dog and always supervise your dog's use of this toy. If damage occurs, please discontinue use of the toy immediately.