This ball has been the subject of much conjecture. It seems that, when this ball was first released, it was merely a urethane ball with a bulb shaped weightblock.
Then, after a bit, Columbia decided to make it into a mildly reactive ball, and changed it over without really telling anyone the difference.
It has been said by some that you can tell one version from the other by the number of teeth between the fangs on the logo, but I never knew for sure if that was accurate or not.
The original release was regular urethane, which was later changed to a flexel reactive coverstock, but the weightblock stayed the same.
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ILLEGITIMI, NON-CARBORUNDUM!