Diadem Pro X is the most powerful and firm option for string in the Diadem line. Designed with the help of current pro tennis players, this poly string is designed to provide a stiffer option than the Flash string, with a hexagon cross section. The firmness results in an explosive response off the string bed with adequate spin production
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Pro X is a great string for the Axis 98. It pairs well as a hybrid with Flash.
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Darren · June 21, 2026
This last longer than most strings which lessens the annoyance of switching racquets mid match