In Penn's first year, 13,000 tennis balls were produced (1910).  Penn now produces 13,000 tennis balls in 1 hour (2010)

The first tennis balls produced were not put in pressurized cans but came fresh off of the line and were trucked to dozens of factory branches which sold “fresh” tennis balls.  Pressurized cans were introduced in 1922 to give the tennis balls a longer shelf life.

During the past Decade, our factories have used A LOT of felt in the production of tennis balls…

More than 150 million square feet of optic yellow felt has been used to produce tennis balls.

A blanket of this much felt would cover almost 6 square miles of area.

If we cut a continuous strip of this much felt to a one-inch width, it would extend more than 350,000 miles long.

You could wrap that around the earth about 14 times.

And it would be about as far to the moon and halfway back!

Tennis balls are made for different surfaces.  Extra Duty felt for hard courts, Regular Duty for softer courts (clay, grass) and extra duty high altitude for places at higher elevations.