Swing for the fences with the NFHS THUNDER HEAT® Fastpitch Softball. Exceptional construction for exceptional compression, this softball helps athletes deliver fast pitches and accurate throws. 12" NFHS Approved Fastpitch Softball Center: Poly Precision blended crosslinked polyurethane system High density and maximum resiliency Leather cover provides improved grip and protection Seams: Raised COR: 0.47 Compression: 375 lbs. Official state adopted softball for Connecticut, Delaware, Idaho, Kentucky, Massachusetts, Missouri, Montana, North Dakota, Pennsylvania, Texas, Vermont, Washington and West Virginia