Driveline Smash Factor balls for pitching machines.
From Driveline's website: "The Smash Factor Ball™ closely mimics the flight of an actual baseball out of a pitching machine but has enough “give” to feedback to hitters how well they’ve squared a ball up (like a plyo). All without ever hurting hands or breaking bats."
Purchased for my son who never used them. They have never been out of the box. Paid $70+ for these new.
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