Dudley Thunder Heat 12 NFHS Fastpitch Softballs Composite Cover Core .47 Compression 375lbs 1 doz. The Thunder Heatr poly center fast pitch high school softball uses a precision blended crosslinked polyurethane system and is designed for high density and maximum resiliency. UPC 026307430654Model Number: 43065Y Archive | Link To Ballgloves Price Check |