The Rubicon™ features a very unique weight block, named the Rondure™ core. We have made strategic cuts along the X and Y axes of the shape to create a mildly asymmetrical shape. This delivers the best of both worlds in the continuation of a symmetrical core with the defined motion of an asymmetrical shape. Basically, it gives you a similar shape to a symmetrical ball with a balance hole in it. We have wrapped it with eTrax-S20™ solid reactive coverstock. This latest version of eTrax cover creates increased traction in oil combined with the Rondure™ core for more shape off the spot.