Roto Grip is doing something different with the Rubicon upper-mid performance ball in their HP3 line of balls. This ball introduces the asymmetrical Rondure Core which was designed to provide more ball motion overall without the need for the now banned balance hole. This performance core is wrapped in Roto Grip's eTrax-S20 Solid Reactive coverstock which can be sanded or polished to meet your needs without reducing traction or responsiveness. Out of the box this ball is ideally used on medium to medium/heavy oil conditions.