Wikipedia:
cavity back
A Cavity back golf club refers to a specific kind of golf iron. In a cavity back iron, most of the weight of the clubhead is distributed around the perimeter of the head, creating a "cavity" in the center of the clubhead. This process maximizes the sweet spot of the clubhead, allowing shots struck slightly off the center of the clubhead to have more distance and control than a similarly off-center shot with a traditional muscleback iron.
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