The Wiffle Ball 9" Baseball Sized Ball is safe anywhere meaning you can play anywhere! The ball was designed specifically to curve like crazy and is a great training product for children. This light weight ball cannot be thrown or hit at any great distance so it is perfectly safe to use. Baseballs are regulation size with 9" circumference. Very durable and great training product for children. Curves like crazy and is safe and fun to play anywhere. Lightweight ball that cannot be thrown or hit any great distance. Designed to take the place of baseball, stickball and softball for boys and girls in back yards and city streets. Also an excellent indoor ball.