Curve Ball Training Baseball for Pitchers (Learn to Throw a Curve) & Hitters (Learn to Hit a Curve) The Learning Curve Training Baseball for both Pitchers & Hitters. Durrable Rubber Construction, with Easy to Follow Instructions to teach proper curveball mechanics to pitchers. The Learning Curve ball is also for hitters to practice and improve on their cruveball hitting skills. Used by Players, Coachs and Parents from Little League to High School and Up. Additional Quanities Available Upon Request