Until such time as manufacture of the balls specified by the Two Ball and Delta rules exists, the rules provide that common playground balls may be used in place of regulation balls. In fact the Two Ball and Delta ball, as specified, is based on an actual playground ball of a size to fit in my own open hand, gripped without permitting me to close my hand on it. Players should confidently hold, carry, catch, grab, or throw the ball with a single hand, yet without so sure a grip as to preclude experiencing some risk of losing control of the ball, dropping it, or having it grabbed away. The balls are scaled for player stature.
•Are the ball sizes correct to meet their intended usage in play?