The Hammer Effect 15 lb Reactive Resin Polished Asym Drilled Medium-Heavy Purple bowling ball is a high-performance bowling ball designed for ten-pin bowling. Manufactured by Hammer, this ball features an asymmetrical core and a reactive resin coverstock in purple, blue, and black colors. With a differential of .050 and a RG of 2.470, this ball is ideal for medium-heavy lane conditions. Perfect for competitive bowling matches and meets the standards set by the United States Bowling Congress (USBC).Has Jopo thumb inserts
