Product Description The Track Theorem was a standout ball this year and made many Ball of the Year lists. Its big sweeping motion and strong continuation make the Theorem a ball that is easy to throw strikes with. Its also a ball that is hard to outdo and follow, but our engineers cracked the code with the new Track Theorem Pearl bowling ball. The goal wasnt to reinvent anything here but to enhance what we already have. The best way to create a complement to the line was to start with the same core and cover base and add a pearl to the HK22-Prime Response cover. Adding a pearl to this combination pushes the Theorem Pearls reaction further down the lane, creating a sharper and more defined breakpoint than the original.Color: Purple/Blue/Sky Blue *Please note that colors may slightly vary from image shownCoverstock: HK22 – Prime Response PearlWeight Block MC2 AsymFactory Finish: 500, 1000, 1500 Siaair Micro Pad / Factory CompoundFlare Potential: 6″ Plus (High)Radius of Gyration (RG): 2.473Differential (Diff): 0.046Intermediate Differential (Mass Bias): 0.017WeightRGDiff.Interm. Diff.162.4850.0440.017152.4730.0460.017142.4870.0460.017132.5970.0410.014122.5930.04310.014