The Tecnifibre X-Code 1.25 tennis string set is the missing link between multifilament premium string & monofilament polyester. The set utilizes the full hybrid technology that integrates polyester & polyurethane. It has a diameter of 1.25mm (gauge 17L) & offers limited elasticity for better control & firmer feel without extensive vibrations or fatigue. The X-Code 1.25 is available in black.