Black pin is original.  Red pin batches cured too hard, so they don't hook as much (good dry lane ball).  Violet ZC is the same as the original, also.

I had the red pin and I would consider a medium to
medium dry ball, but not a dry lane ball, because of
the core still being pretty strong. Still would be
goof for broken down house shots !
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Thirtyclean (Well maybe 29, or 28, most of
the times !)