ProNine Slowpitch Softballs 52 COR 12 Inch (Multi-Packs) Bundled With Covey Sports Bag. Great for men's, women's, or kids softball games and practices; Ball approved by ASA. 52 COR/300 LB compression balls are designed to reduce injury and to not dent your bat when hitting. Ball has medium seam height, synthetic tacky grip cover, and a solid polyurethane core. Comes with versatile Covey Sports bag to keep your softballs together when not being used!