Pro X

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 from the edged shape.

Unlike most stiff polys that feel completely dead, the Pro X is designed to give an "explosive" launch off the string bed. It is very firm and holds tension well. Players with fast, established swing speeds will benefit the most.