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Roto Grip continues to do something different with the Rubicon upper-mid performance balls in their HP3 line of balls. Like the original Rubicon and the Rubicon UC2 the Rubicon UC3 (Ultimate Concept 3) uses 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 Tour-ethane Pearl Reactive coverstock which was formulated to offer max performance as well as control when facing high friction patterns and surfaces.