Strings PRO X-most powerful and firm option for poly string

Powerful and firm, designed for intermediate to advanced players.  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. Length: 40 feet / 12.2m Colors:  Silver, Blue Gauges Available 18 (1.15mm) Best feel  17 (1.20mm) 16L (1.25mm) 16 (1.30mm) 15L (1.35mm) Most durable