Easiest curve ball you’ll ever throw! The 9-in Wiffle Ball baseball is designed for a true, slow, and limited flight. This is the plastic perforated ball designed for more curve and slider pitches and more wiffs or strike outs. No one knows how it works, it just does! More than 50 years after the first Wiffle Balls were produced and sold, the Wiffle Ball name is known around the world. There are Wiffle Ball fanatics, and countless adult leagues across the Nation. Used by generations, this is simply the best product to teach kids how to play baseball or softball.