The Brunswick Defender Hybrid high-performance ball is the first to use the HyperKinetic22 (HK22) reactive urethane coverstock formula. The ACT 3.0 Hybrid additive combined with the HK22 coverstock created a ball with optimal ball reaction resulting in increased backend on higher oil volume. The Portal X core has a dense flip block added to the bottom. This addition adjusts the location of the mass and creates a higher RG and differential which increases the down-lane motion of the bowling ball.