ray allen ball on a rope - professional quality dog training ball - blue 2.5" diameter with tee handle ray allen manufacturing the ray allen ball on a rope is the perfect reward toy for your working dog. the ball features a hollow core combined with a soft rubber surface with knobs that allows your dog a better grip. the medium ball measures 2.5 inches in diameter ball with a t-handle. it is durable yet still soft enough to protect against injury while playing. please note, this ball is not intended to be used as chew toy, do not leave unattended with your dog.