This combination of lower RG and Higher Differential weight block combined with an aggressive solid coverstock will deliver the ultimate in "BENCHMARK" performance. Radius of Gyration (RG): 16lbs - 2.51; 15lbs - 2.52; 14lbs - 2.53.Differential (Diff): 16lbs - 0.047; 15lbs - 0.049; 14lbs - 0.051. This is a brand new in box 1st quality ball and is un-drilled. As we have many of these available, this listing is not for a specific pin or top weight. Select weight from drop down menu in the listing. The item "Storm Pro Motion Bowling Ball" is in sale since Saturday, June 11, 2016. This item is in the category "Sporting Goods\Team Sports\Bowling\Balls". The seller is "bowl300300" and is located in Webster, New York. This item can be shipped worldwide.