These look like bowling balls. From Spock's Brain and Obsession.

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Archived from the IMDb Discussion Forums — Star Trek

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unex — 3 years ago(December 05, 2022 10:05 PM)

These look like bowling balls. From Spock's Brain and Obsession.

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/.​ — 3 years ago(December 05, 2022 11:33 PM)

Those are space orbs.
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jbaker1-2 — 2 years ago(April 27, 2023 08:06 PM)

TOS didn't have a huge budget and the prop department frequently used everyday objects in creative ways (McCoy's medical sensors were salt and pepper shakers, for one example). I'd bet a weeks pay those objects are indeed bowling balls.
There are 8.2 billion people in the world. 8.19 billion of them have never heard of and don't give a fuck about Charlie Kirk. Get over it.