Size: The diameter of the big ball is 3.5 inches / 9 cm. Product material: Almost indestructible foam material and strong nylon rope, soft and safe, suitable for dogs of all ages.< /p> Interactive and Fun: This dog ball with leash is fluffy, bouncy, soft, you can throw the balls and command your dog to retrieve them, strengthening the bond between you and your dog, the tied leash is also ideal for tug of war and fetch games. . WATER TOY: This fitness ring toy floats on water and is ideal not only on land, but also in swimming pools, rivers or lakes.