Regular exercise keeps dogs happy and healthy. The K9 Fitness by Zeus Rope and Double Tennis Ball Dumbbell toy is perfect for interactive fetch, tug and gentle chew. Rope fibers help floss dog's teeth as they chew and play. Chasing tennis balls comes naturally to most dogs. The K9 Fitness carefully selected colored ball and rope toy makes it easier for them to see. The bright colors stand out better against any background. Key Features : 24 K9 Fitness by Zeus models available Blue and Green. Tough tennis ball and rope construction. Perfect for playing fetch or tug with your dog. Rope Dumbbell Size : 12 in (30.5 cm) Tennis Ball Size : 6.35 cm dia. (2.5 in dia.)