This ball is crafted for maximum resiliency and an authentic feel on the diamond. Thunder Heat™ technology makes the ball less susceptible to compression changes so this ball can be played in any temperature. The high-density precision blended cross-linked polyurethane center and a durable yellow leather cover makes the ball resilient and gives pitchers a great feel. Constructed with a .47 COR rating and a compression limit of 375 lb; the 12" softball is certified for use in the ASA. Sold in a dozen.