- Penn began manufacturing tennis balls in Jeanette, Pennsylvania in 1910.
- Today, the company uses an 11-step process, which is surprisingly satisfying to watch.
- Natural and synthetic rubber is kneaded and melted into round molds. The balls are formed and covered with felt, then they are packaged in pressurized tubes.
- Watch all 11-steps in the video above.
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EDITOR'S NOTE: This video was originally published on May 30, 2017.