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Old 01-02-2013, 10:24 AM   #10
AR15
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Join Date: Mar 2006
Location: Gulf Coast, USA
Posts: 1,125
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I had a bucket of them with my ball machine, and I found them slightly firmer than regular tennis balls, but I would not describe them as "rocks" by any means. They hit pretty much like new firm balls.

For the tennis ball machine, I like these because they throw consistently vs balls with varying levels of compression.

And, I think I've felt more elbow pain when I've hit dead balls than I've felt from the Tretorns.
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