PlyoCare balls weren't sourced from a factory catalog. They were designed inside Driveline's training facilities, iterated on athlete data, and refined across thousands of throwing sessions. The softball line carries that same design intent, sized and weighted for the windmill delivery rather than adapted from the baseball set.

The seamless surface is intentional — not a cost-saving measure. Seams give the hand a familiar reference point and let it fall back into the pattern these drills are built to change. Removing them removes the shortcut. The arm has to find a new, more efficient way to move.

Every design decision — the weight increments, the sand fill, the PVC rubber shell, the 12" circumference — was made to optimize a specific training outcome. Nothing about this ball is arbitrary.