Regular exercise keeps dogs happy and healthy. The K9 Fitness by Zeus TPR Ball toy has great bounce and is soft on teeth and gums. Inner tennis ball will drive dogs wild and entice play. Perfect for interactive toss, fetch and play!Dogs see shades of blue and yellow. The K9 Fitness by Zeus collection was particularly designed with that in mind. The toys' blue and yellow colors can easily be located by your dog regardless of the environment they are playing in.Blue and Green.Tough TPR and tennis ball construction.Perfect for playing fetch with your dog.Recommended for: Perfect for playing fetch with your dog.Size:TPR Ball Encasing Size : 7.6 cm dia (3 in dia)Tennis Ball Size : 6.35 cm dia (2.5 in dia)