Spin Line 12″ Training Softballs Dozen

Spin Line 12″ Training Softball (DZ) Striped game ball for pitching and overhand throwing practice. Thrown to create and visually measure four seam rotation and spin direction. Based on principles of the Magnus Effect, and used by both beginners and professionals, SPIN-LINE® Softballs make practicing with a purpose understandable and fun and concurrently advance proper throwing mechanics. Max COR.47, 375 Compression Golden thread to highlight ink stripe Solid stripe crosses center of four seams Raised Seams