Brunswick Strategy Bowling Ball The Brunswick Strategy is now part of the Pro Performance lineup, and it has a clear purpose: to help with transition. The Strategy kicks in when your heavy oil ball starts reading the lane too soon. The result is that the front is easy to lengthen and the back has a sharp, defined move. The Strategy is meant to help you stay lined up as conditions change by filling in the gap between your best pieces and medium oil options. The dual-density core is a new direction for Brunswick. For people who play in leagues and tournaments. Performance Level: High PerformanceColor: Black / Blue / SilverleCore: Dual CentricCore Type: AsymmetricalCoverstock: HK22C² - EVO PearlCover Type: Pearl ReactiveFinish: 500, 1000, 1500 Siaair / Crown Factory CompoundLane Condition: Medium-Heavy oil Weights: 12–16 lbsRG (15 lbs): 2.509DIFF (15 lbs): 0.047INT DIFF: 0.016Warranty: Two years from purchase date