The Circle balls are actually very versatile with drillings due to those big dynamic cores. So if you take those 4 balls, you can drill them different ways and actually have 16 balls with different reactions if you have a clue what you're doing. I know a guy that was at the masters and Jason Couch had a 9 ball combination of all TPC Shooters, TPC Players, and TPC Shooter XLs.
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-DP3