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One of the main features of the Hammer X Driver is the removal of clubhead material from the middle of the clubhead, leaving two large open slots that are visible at address.

The Hammer driver is over a decade old, and the changes they made to a traditional clubhead in search of performance is what made it illegal. Graphite shafts are now optimized to generate maximum kick and clubhead speed. This constant drive for improvement has led to recent advancements in club face technology, leading to a thinner club face with a larger sweet spot. There is a bit of a back and forth every year between research and development teams from these major manufacturers and the USGA each year, as the goal of the manufacturer is to pack as much technology into the club as possible without crossing the line into “non-conforming.” Every major golf manufacturer submits all of their latest club models to the USGA, and they will not sell them unless they are considered to be “conforming.” These clubs are allowed to be used in any golf event from a local charity tournament to the PGA Tour. The USGA releases a list every year that includes every golf club that has been inspected and deemed legal for play. There are certain specifications that all golf equipment needs to conform to in order to be considered legal for play. The design of the driver head is what makes the Hammer X an illegal golf driver.