Nike Sumo Driver

Does anyone know what exactly is illegal about Nike Sumo 2?
Does anyone know what exactly is illegal Nike Sumo 2? I own a of these, under the Callaway FT-i. The FT-i seems to be fine. I always heard about the Nike Sumo 2 is illegal. Everyone knows exactly what is "illegal"? What regulations do not break? Thanks in advance.
too "springboard" in the face … the faces of the drivers must have a horn or the coefficient of restitution (bounce on the trampoline or face) that meets certain specifications … those who do are considered illegal in the case of drivers of Nike, that were barely wide enough for you to possibly five meters with the same momentum … Callaway ERC old pilot had a corresponding number of high were non-compliant (illegal) when legal horn has not been made last season and was expected to hand, another major clubmakers trial to follow, making the maximum allowable COR in the club face to give players maximum distance, but the USGA specifications never changed … clubmakers created shortly after imaginative solutions to get more clubs remotely using different materials (composite overhead is now harder to move the center of gravity and depth in the head to give more lift / Release and more to me (MOI), which is the resistance to twisting at impact clubs … providing more precise strikes conditions to launch maximum impact, even slightly off center …
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