Small, green, fuzzy and a favorite of pets everywhere, tennis balls are one of the most popular pieces of sports equipment in the world.

But how are they made?

Vimeo user Benedict Redgrove uploaded a video he made documenting the whole process from start to finish at the Wilson factory for balls destined for the US Open.

Much more complicated that you would expect, the process includes more than 24 steps to make the final ball, including several steps where people are involved by hand.

This is in order to produce a ball which is perfectly balanced, without any nozzles to fill the ball with air.

In my opinion, Redgrove really served up an ace!

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