Durable Safe - Made of high-quality TPR rubber, durable lightweight to float on water. Ideal f owners dogs to do interactive games. Exercise - Dog Balls can be thrown into the distance f the dog to connect, exercise the dog's reaction speed, make the dog move me agile. Interaction - Encourage interaction to help the dog owner establish a tacit bond with each other. Raised Design - The surface of the dog ball is covered with most of the raised particles, which is conducive to cleaning the dog's mouth eliminating tongue coating bacteria. Unique Design - The double col matching design can attract dogs' interest in chewing toys, the built-in sound device can effectively prevent dogs from falling off swallowing during the chewing process. Material: Rubber. 6.5Cm in diameter, hollow ball, weighing about 53g, with BB call, crisp sound.