Take the field no matter what the weather brings with the Dudley 12" ASA Thunder Heat Fastpitch Softball. This ball features a yellow leather cover and a high-density polyurethane center for maximum resiliency and feel. Constructed with a .47 COR rating and 375 lb. compression, the Dudley Thunder Heat Softball is less susceptible to compression changes due to changes in temperature. Sold by the dozen. NOT ELIGIBLE FOR FREE SHIPPING.