14lbs 2oz | 4-4.5"pin | 2.29oz TW. Roto Grip Magic Gem Bowling Ball. Roto Grip Defiant LRG Core. Roto Grip MicroTrax Hybrid Reactive. High Performance Bowling Balls ,Roto Grip HP4 Bowling Balls. Upon further evaluation and testing, we discovered that modifying the composite of this core shape allowed us to create the DEFIANT™ LRG CORE.
