Good quality baseballs and softballs are made completely differently.
Inexpensive softballs are made of a cork and rubber mixture and a vinyl or other synthetic cover, then stitched with yarn.
The vast majority of softballs, both slowpitch and fastpitch, are made of a solid polyurethane core and a leather cover stitched with nylon thread. The cover on better softballs is glued to the core before stitching. A fastpitch softball has raised seams and a slowpitch softball has flat seams.
The core is the ball itself, not to be confused with COR, which stands for Coefficient of Restitution. Softballs are measure by two variables - COR and Compression. The higher of either number the harder the ball.
The compression is simply the pounds per square inch required to compress the ball 1/4". The COR is the speed in which the ball goes from the compressed state back to its original round state (rebound).
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