Reaction CharacteristicsCombining the red hot performance of the original Inferno's Ultra Low RG core with the aggressiveness of a rough buff, pearlized Activator coverstock, the Prime Zone sets a new standard for traction that leaves other balls behind. For improved hook potential, a more angular breakpoint, and better mid lane recovery and forgiveness, there's only one Prime you can count on Prime Zone.Brunswick's International Series has been developed specifically for Asian markets using core and coverstock systems that provide Asian bowlers with a range of equipment that matches up to typical Asian lane conditions. The looks of International Series balls are also adapted to Asian tastes making the International Series completely customized for Asian bowlers. Available only through International Distributors.Response TimeTo understand the International Zone Coverstocks better we will be using a 1 10 number scale system after the coverstock name to describe Response Time. Response Time is how fast or slow the ball changes direction when it encounters friction. The Higher the number the Faster the ball will change direction similar to SkidSnap. The Lower the number the Slower the ball will change direction similar to Smooth Arc.Product Type Bowling Balls