The roar of the crowd, the shouts of the umpire, the crack of the bat hitting the ball-these are the unmistakable sounds of a baseball game. Over the last few decades, however, one of those sounds has changed; now the bat tends to make a ping that resonates when it hits the ball. It's the sound of aluminum rather than wood making contact with the ball. Although wooden bats still are the only type used in professional baseball, aluminum bats are used extensively in nonprofessional baseball and softball leagues. In fact, nearly 95 percent of all baseball bats used in the U.S. are made of aluminum.
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