 
The Piston core brings with it months of testing and validation in conjunction with the best player of our time: Jason Belmonte. Developed specifically for his line, the Piston Core creates separate helical archs that make the shape corkscrew as it tumbles. You can see the channels on the sides of the Piston Core and the large band through the equator which displaces the mass in a very specific way.
Core Type
              Symmetric
          16 pounds
RG
              2.510
          Diff
              0.047
          15 pounds
RG
              2.520
          Diff
              0.049
          14 pounds
RG
              2.530
          Diff
              0.051
          13 pounds
RG
              2.590
          Diff
              0.045
          12 pounds
RG
              2.650
          Diff
              0.035