Wiffle ball is a variation of the sport of baseball designed for indoor or outdoor play in confined areas. It is also known in some places as "Wiffer Ball". The game is played using a perforated, light-weight, resilient plastic ball and a long, typically yellow, plastic bat.

The game became popular nationwide by the 1960s, and is played in backyards and on city streets and beaches. The game is similar to baseball, and can be played by between two and ten players.

Miniature versions of baseball have been played for decades, including stickball, improvised by children, using everything from rolled up socks to tennis balls. The ball most commonly used in the game was invented by David N. Mullany at his home in Fairfield, Connecticut in 1953 when he designed a ball that curved easily for his 12-year-old son. It was named when his son and his friends would refer to a strikeout as a "whiff". The classic trademarked Wiffle Ball is about the same size as a regulation baseball, but is hollow, lightweight, of resilient plastic, no more than 1/8 inch (3 mm) thick. One half is perforated with eight .75-inch (19 mm) oblong holes; the other half is non-perforated. This construction allows pitchers to throw a tremendous variety of curveballs and risers. Wiffle balls are typically packaged with a hollow, hard plastic, yellow bat that measures 32 inches (810 mm) in length and about 1.25 inches (32 mm) in diameter.

Source: Wiffle ball from Wikipedia

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