Close call between the Combat Zone and the Quantum Jade. Both balls did great things for me while I was in juniors, shot my first 700 with the Jade (701 followed by 757 a week later). Combat Zone was the first "reactive" ball I had, Jade the first particle ball. Both did great, but retired/sold both of them. Dont throw Big B anymore though roll too early...
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If I could only pick up a 7 pin.....
