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With the recent modifications to PBA rules concerning traditional urethane Hammer bravely worked on the challenge of creating a ball that emulates the performance attributes of the renowned Purple Pearl Urethane Hammer all without using urethane. The NU in Blue Hammer Bowling Ball stands for “not urethane” yet it superbly delivers the coveted urethane ball motion bringing adaptability seamless consistency and predictability. It is perfect to throw on the most demanding lane conditions.